Here’s a countdown you can use to ring in the New Year:

2019 is the sum of consecutive numbers three different ways:

1009 + 1010 = 2019

672 + 673 + 674 = 2019

334 + 335 + 336 + 337 + 338 + 339 = 2019

There is one way that 2019 is the sum of consecutive odd numbers:

671 + 673 + 675 = 2019

2019 is the difference of two squares two different ways:

338² – 335² = 2019

1010² – 1009² = 2019

2019 is the sum of three squares nine different ways:

43² + 13² + 1² = 2019

43² + 11² + 7² = 2019

41² + 17² + 7² = 2019

41² + **13**² + **13**² = 2019

37² + 25² + 5² = 2019

37² + 23² + 11² = 2019

37² + 19² + 17² = 2019

35² + 25² + 13² = 2019

31² + **23**² + **23**² = 2019

2019 is the hypotenuse of a Pythagorean triple:

1155-1656-2019 so 1155² + 1656² = 2019²

2¹⁰ + 2⁹ + 2⁸ + 2⁷ + 2⁶ + 2⁵ + 2¹ + 2⁰ = 2019

2019 is a palindrome in a couple of bases:

It’s 5B5 in BASE 19 (B is 11 base 10) because 5(19²) + 11(19) + 5(1) = 2019,

and 3C3 in BASE 24 (C is 12 base 10) because 3(24²) + 12(24) + 3(1) = 2019

Every year has factors that often catch people by surprise. Today I would like to give you my predictions for the factors of 2019:

2019 will have four positive factors: 1, 3, 673, and 2019

However, 2019 will also have four negative factors: -1, -3, -673, and -2019

Which factors, positive or negative, will be your focus in the coming year?

Finally, I’ll share some mathematics-related 2019 and New Year tweets that I’ve seen on twitter. Some of these tweets have links that contain even more facts about the number 2019.

A Palindromic Magic Square for the Year 2019 #math https://t.co/Of7tj2e41K pic.twitter.com/TiFGuvPpxQ

— Learn Fun Facts (@edmarklaw) December 29, 2018

That tweet inspired me to make my own 3 × 3 Magic Square where every number is different but every row, column and diagonal totals the same number:

Share a 'mathsy moment' every day in 2019 with this calendar of mathematical anniversaries and date-related number play — including links to explore, and in various formats to download, edit, and import: https://t.co/iivxZKFgww • #HappyNewYear #maths #math pic.twitter.com/A0BBdrGq3R

— Maths Ed (@MathsEdIdeas) December 27, 2018

19 bold predictions for science and technology in 2019 https://t.co/NJnz0ZDwTD #supergridcloudplatform

— Mark Barnes💡 (@markbarnes19) December 29, 2018

Happy New Year 2019 https://t.co/O41xvcQU1l

— Math 4 Everybody (@Math4Everybody) December 30, 2018

— primes & non-primes (@primesnonprimes) December 30, 2018

Ready for 2019 with math challenge from @mathequalslove …thank you!! Happy holidays!🎄🎄@RicksonWolves pic.twitter.com/m0iwKySoAS

— Rickson MATH! ➕➖➗✖️ (@MathStone78) December 21, 2018

here's a 2019 #algebra problem for you to start the new year.

— M Shah (@shahlock) December 30, 2018

Find all quadratics such that solutions to (ax + b)(cx + d) = 0 are integer with a,b,c,d all unique and chosen only from {2,0,1,9}#math

2019 is the smallest number that can be written in 6 ways as the sum of the squares of 3 primes:

— Ed Southall (@solvemymaths) December 30, 2018

7² + 11² + 43² = 2019

7² + 17² + 41² = 2019

13² + 13² + 41² = 2019

11² + 23² + 37² = 2019

17² + 19² + 37² = 2019

23² + 23² + 31² = 2019

Math up your countdown to 2019… #HappyNewYear #maths #math pic.twitter.com/2Iy725OBUy

— Maths Ed (@MathsEdIdeas) December 30, 2018

It's also the sum of all unique perfect powers up to 3⁵ = 243:

— Ed Southall (@solvemymaths) December 30, 2018

1² + 2² + 2³ + 2⁴ + 2⁵ + 2⁶ + 2⁷ + 3² + 3³ + 3⁴ + 3⁵ + 5² + 5³ + 6² + 6³ + 7² + 10² + 11² + 12² + 13² + 14² + 15² = 2019

— Journal of Mathematics and the Arts (@MathsArts) December 30, 2018

Happy New Year 2019! (And Mathematical Facts About 2019) https://t.co/Y2NOiVw4eZ pic.twitter.com/jJyULJuKXf

— Learn Fun Facts (@edmarklaw) December 31, 2018

2019 facts in 2 mins 19 seconds. Featuring:

— Matt Parker (@standupmaths) December 31, 2018

2019

= 2×22+2/2)^2 −2−2−2

= 1+(1+1)^11 − (11−1)×(1+1+1)

= 9+(9999−9) / 9+9×99+9

(Can you find solutions for other digits?)https://t.co/7PnByFY0Az

2019 = 0³ + 1⁸ + 2⁷ − 3⁹ + 4⁶ + 5⁴ + 6² + 7⁵ + 8¹ + 9⁰

— Matt Parker (@standupmaths) December 31, 2018

(All the digits 0 to 9 raised to the power of all the digits 0 to 9.)

2019 facts in 2 mins 19 seconds https://t.co/7PnByFY0Az

Happy 2019! (Embedded within mysterious palindromic primes that consist only of the digits 2, 0, 1, and 9.) https://t.co/kNu2IZfGdH pic.twitter.com/uBN1njv2IF

— Cliff Pickover (@pickover) December 31, 2018

Here are the six prime cuboids with a diagonal of √2019.

— Vincent Pantal🍩ni (@panlepan) December 31, 2018

2019=7² + 11² + 43² = 7² + 17² + 41² = 13² + 13² + 41² = 11² + 23² + 37² = 17² + 19² + 37² = 23² + 23² + 31² .#HappyNewYear2019 pic.twitter.com/8XdMFNhNAn

2019 is a Happy Number !

— Vincent Pantal🍩ni (@panlepan) December 31, 2018

2²+0²+1²+9²=86

8²+6²=100

1²+0²+0²=1#HappyNewYear2019 https://t.co/1NgFQzKAgV

5

@pickover @solvemymaths @matescercanas @fermatslibrary @standupmaths Happy 2019 – https://t.co/D73ve0f0j6 pic.twitter.com/hdz7sp9NAZ

— INDER J. TANEJA (@IJTANEJA) December 31, 2018

5

A Mathematical countdown to the New Year…the perfect soundtrack to any geek’s Hogmanay celebrations!

— Chris Smith (@aap03102) December 31, 2018

All the best for 2019, everyone!@alexbellos @RachelRileyRR @JohnSwinney @TESScotland @scottishmaths @Mathematical_A @MathsScot @solvemymaths @FryRsquared @mrbartonmaths #HNY pic.twitter.com/kqqpUG3FUn

How mathematicians count down to the year 2019…. https://t.co/kNu2IZfGdH pic.twitter.com/Ef2iPTYEWp

— Cliff Pickover (@pickover) December 31, 2018

Here's a special countdown for 2019. Happy New Year! pic.twitter.com/hYvBU6eIId

— Fermat's Library (@fermatslibrary) December 31, 2018

2 + 0 + 1 = √9

— primes & non-primes (@primesnonprimes) December 31, 2018

One of the ten puzzles in the link in the above tweet is this cryptarithmetic one. #math #happynewyear pic.twitter.com/Zv3K3doD7s

— M Shah (@shahlock) December 31, 2018

π = 3,141592653589793238462643383279502884197169399375105820974944592307816406286208998628034825342117067982148086513282306647093844609550582231725359408128481117450284102701938521105559644622948954930381964428810975665933446128475648233786783165271２０１９ 🤓

— can gurses (@canitti) December 31, 2018

Happy New Year! Some neat formulas that equal 2019. #NewYearsEve

— Derek Orr (@Derektionary) December 31, 2018

10*9*(8+7+6)+5!+4+3+2*1 = 2019

10*(9+8)*7+6!+5!-4-3*2-1 = 2019

10*(9+8*7-6+5!+4!)-3!*2+1 = 2019

(10+9)*(8+7+6)*5+4!+3-2-1 = 2019

10*9!/(8*7*6*5)-4!*3!+2+1 = 2019

The absolute best thing about 2018 is that not only is 2018 a semiprime number, but it is the 579th semiprime number, and 579 is also a semiprime number. 2019 is a semiprime number, but it’s the 580th, and 580 isn’t a semiprime number, so yaaaaaawn, right?

— Richard Osman (@richardosman) December 31, 2018

#BonneAnnee2019 #HappyNewYear2019 pic.twitter.com/CoMSopqkP6

— Vincent Pantaloni (@VPantaloni) December 31, 2018

من جماليات الرياضيات ..🌻

— ﮼عبدالله (@Abdullahjalal99) January 1, 2019

العام الجديد ( 2019 ) بلغة الارقام تصاعدياً وتنازلياً : pic.twitter.com/vuzZwoKNhT

Ten New Year’s Algebra Puzzles For 2019 — Try this playful math challenge to ring in the New Year. https://t.co/w8PRWDqcg1

— Denise Gaskins (@letsplaymath) January 1, 2019

Happy Nested New Year!

— Simon Pampena (@mathemaniac) January 1, 2019

√2019+ √2019+ √2019+ √2019… pic.twitter.com/at0cykWbXz

2019 = 1 + 2 × 34 + 5 × 6 × (7 × 8 + 9)

— Algebra Fact (@AlgebraFact) January 1, 2019

Pues eso, pic.twitter.com/k86t3WAte2

— Luis Randez García (@randez_luis) December 31, 2018

Today's #Kaleidocycle №0114

— Tomoya Tendo (@end_tt) January 1, 2019

Happy New Year 2019#Fusion360#HappyNewYear2019 pic.twitter.com/hqCae48njb

#mtbos Let's have some mathy fun! 2019 Mathematics Game: Playful Math for All Ages https://t.co/BsK8sY4vgL

— Denise Gaskins (@letsplaymath) January 1, 2019

Feliz

— Luis Randez García (@randez_luis) January 1, 2019

1^4+2^4+3^4+5^4+6^4

— MathHappiness (@MathisHappiness) January 1, 2019

#mathematics #satexam #actexam #mathteacher #teachmath #study #riddle #thinking #learning #test #highschool #GACKT #YOSHIKI #NewYears2019 #geometry #calculus #algebra #stem #reasoning #math #competition #amc #aime #olympiad

— Matematik_Man (@matematik_man) January 1, 2019

Happy New Year!

Solution: —> https://t.co/crlkg6kwuC pic.twitter.com/3Kks0jz8ot

I feel like twitter needs more posts about beautiful mathematics, so I decided to start a new weekly series featuring the best curves of maths. You'll experience #50FamousCurves, see how to draw them and learn about their various applications. Stay tuned and spread the word! ❤️ pic.twitter.com/z9EiW4aGTt

— Tamás Görbe 🇭🇺🇬🇧🇪🇺 (@TamasGorbe) December 24, 2018

And finally, here is my contribution to 2019 twitter:

Facts and Factors of 2019 https://t.co/2inisqinMV pic.twitter.com/ij8kIrMsVC

— Iva Sallay (@findthefactors) December 29, 2018