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A214880
5-adic valuation of A007185.
4
1, 2, 4, 4, 5, 6, 7, 8, 9, 10, 11, 12, 17, 14, 15, 18, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 29, 29, 30, 33, 33, 33, 35, 35, 36, 37, 38, 40, 40, 41, 42, 43, 44, 45, 46, 47, 48, 50, 51, 54, 54, 54, 54, 55, 56, 57, 58, 59, 61, 61, 63, 63, 66, 66, 66, 67
OFFSET
1,2
COMMENTS
a(n) >= n.
It appears that the density of n such that a(n) = n is 4/5.
PROG
(GAP) A214880 := function(max) local result, i; result := [5]; for i in [2..max] do Add(result, result[i-1]^2 mod 10^i); od; result := List(result, x->Valuation(x, 5)); return result; end;
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Eric M. Schmidt, Jul 29 2012
STATUS
approved