Re: 2025: Division by digit removal.

Am 02.01.2025 um 22:37 schrieb Moebius:

Am 02.01.2025 um 17:13 schrieb sobriquet:

Op 01/01/2025 om 16:23 schreef Alan Mackenzie:

The year is now 2025.
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2025 is divisible by 9.  To do this, you merely have to remove the digit
0, leaving 225.
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225 is also divisible by 9.  Again, remove one of the 2 digits, leaving
25.
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25 is divisible by 5.  Guess what, to do this you remove the 2 digit
leaving 5.
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Well, that's as far as it goes.
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Happy new year to you all!
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https://www.wolframalpha.com/input?i=%28sum+n%3D1+to+9+n%29%5E2
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https://www.wolframalpha.com/input?i=+sum+n%3D1+to+9+n%5E3

 Jeah,
 2025 = (1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9)^2 = 1^3 + 2^3 + 3^3 + 4^3 + 5^3 + 6^3 + 7^3 + 8^3 + 9^3.

1729.
"1729 is also known as Ramanujan number or Hardy–Ramanujan number, named after an anecdote of the British mathematician G. H. Hardy when he visited Indian mathematician Srinivasa Ramanujan who was ill in a hospital.[14][15] In their conversation, Hardy stated that the number 1729 from a taxicab he rode was a "dull" number and "hopefully it is not unfavourable omen", but Ramanujan remarked that 'it is a very interesting number; it is the smallest number expressible as the sum of two cubes in two different ways'." (Wikipedia)
See: https://en.wikipedia.org/wiki/Taxicab_number
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