18 Feb
2011
18 Feb
'11
3:21 p.m.
Mine might be prime, but because it ends in an even digit the probability of this is 0. Tom wrote: << My social security number is prime. . . .
Those who sleep faster get more rest.
18 Feb
18 Feb
3:34 p.m.
New subject: [math-fun] Kevin Brown?
My social security number is prime. . . .
my best friend's address is 1089, which besides being 33^2, is the universal answer for the well-known recipe: 1. start with almost any 3 digit number. 2. arrange the digits in decreasing order and subtract the digits in increasing order. 3. do the same thing again, but this time add the two sorted numbers. my address now is 555+55+5. my previous address was 6! . the one before that was 5500. the one before that was a narcissistic number 126 = 21x6 the one before that was also 5500.... erich
5390
Age (days ago)
5390
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participants (2)
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Dan Asimov -
Erich Friedman