Maths Ed

@MathsEdIdeas

Teacher and school leader sharing ideas, curios, problems and resources to inspire the teaching and ignite the learning of mathematics.

London, UK
Vrijeme pridruživanja: lipanj 2017.

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  1. proslijedio/la je Tweet
    3. velj

    The 1st ever English autogramic pangram (a self-enumerating sentence where every letter of the alphabet occurs at least once) — created in 1985 by Lee Sallows, after challenged by Rudy Kousbroek, the creator of the 1st ever pangram, in Dutch, in 1983.

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  2. 3. velj

    The 1st ever English autogramic pangram (a self-enumerating sentence where every letter of the alphabet occurs at least once) — created in 1985 by Lee Sallows, after challenged by Rudy Kousbroek, the creator of the 1st ever pangram, in Dutch, in 1983.

    Poništi
  3. 2. velj

    We’ll have to wait until 10/10/30101 before a date is palprime (a palindromic prime number) across both dd/mm/y... and mm/dd/y... formats, but there will never be a date that is palprime across dd/mm/y..., mm/dd/y... and the ISO format y.../mm/dd.

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  4. 30. sij

    02/02/2020 is the only date in our lifetimes — and the 1st since 11/11/1111 — to be palindromic across the World, in whatever date format you choose.

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  5. 29. sij

    29, a sexy prime, the sum of 3 consecutive squares 2²+3²+4², the result of the palindromic expression 2×5+3×3+5×2, and the only number in English equal to the amount of strokes needed to write it in capital letters.

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  6. 28. sij

    Q: How many minutes will have passed this year by the end of today, the 28th day of the year? A: 8! = 28 days = 28×24 hours = 28×24×60 minutes = (7×4)×(8×3)×(6×5×2) minutes = 8×7×6×5×4×3×2 minutes = 8! minutes.

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  7. 22. sij

    For the 23rd day of the year, ⌈π^e⌉ = ⌊e^π⌋ = 23 the smallest prime that can be expressed as the sum of 3 consecutive primes, and one of only two numbers that cannot be expressed as the sum of fewer than nine cubes of positive integers (the other being 239)

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  8. 22. sij

    22 is the smallest number that can be expressed as the sum of two primes in three ways, the number of ways 8 can be expressed as the sum of positive integers, and the 1st self-describing number (i.e. it has two twos).

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  9. 19. sij

    20 seconds after 20 past 8 in the evening of the 20th (or unrelatedly the ⌈e^π - π⌉th) day of the year — 20:20:20 on day 20 of 2020. (Happy 20th birthday to everyone born in 2000.)

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  10. 12. sij

    For the 12th day of the year: 12 is a pseudoperfect antiprime that is also the largest known even number expressible as the sum of two primes in one way.

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  11. 3. sij

    2020 is a pseudo palindromic number () that generates a palindromic number when the distinct permutations of its digits are summed.

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  12. 3. sij

    02/02/2020 is the first date to be palindromic across formats (since 11/11/1111). It is the 67th of 335 palindromic ddmmyyyy dates between 10/01/1001 and 29/09/9092, and the 47th of 331 palindromic mmddyyyy dates between 10/01/1001 and 09/29/9290.

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  13. 2. sij

    Repeatedly reversing a number and adding the result produces a palindrome some, but not, we suspect, all of the time (Lychrel nos e.g. 196). The most ‘delayed’ palindrome we currently know of takes 288 iterations whereas 2020 takes just one.

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  14. 1. sij

    2020 written as a palindromic, ambigrammatic, strobogrammatic, vertically and horizontally symmetric, ʇuoɹɟ oʇ ʞɔɐq puɐ spɹɐʍʞɔɐq uʍop ǝpᴉsd∩ expression.

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  15. 31. pro 2019.

    2020 = [22 × 2 + (2⁰ ÷ (2⁰ + (2⁰ ÷ (2 × 2 × 2 × 2 + (2⁰ ÷ (2⁰ + (2⁰ ÷ (22 × 2 × 2 + (2⁰ ÷ (2⁰ + (2⁰ ÷ (2 × 2 × 2 × 2 + (2⁰ ÷ (2⁰ + (2⁰ ÷ (22 × 2 × 2 + (2⁰ ÷ ... ]²

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  16. 31. pro 2019.
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  17. 30. pro 2019.

    At 20 seconds past 20:20 on this New Year’s Eve, we will be exactly 20 days away from it being 20 seconds past 20:20 on the 20th day of the year 2020

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  18. 30. pro 2019.
    10×9×8×7÷6÷5×4×3+2+1+0!=2020
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  19. 29. pro 2019.

    2020 is the smallest number that can be written as the sum of the squares of four consecutive primes and as the sum of two squares in two ways 2020 = 17²+19²+23²+29² 2020 = 16²+42² 2020 = 24²+38²

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  20. 27. pro 2019.

    2020 is an autobiographical number, because in the base of the number of its digits (4) it describes itself: It has 2 zeroes, 0 ones, 2 twos and 0 threes. The largest and only decimal autobiographical number is 6,210,001,000 •

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