A293779 - OEIS

A293779

a(n) is the least nonnegative exponent k such that 2^k ends in A095810(n).

0, 1, 2, 4, 3, 9, 4, 10, 7, 5, 16, 18, 11, 21, 8, 6, 15, 17, 20, 14, 19, 13, 12, 42, 89, 7, 76, 18, 21, 95, 80, 34, 13, 43, 24, 90, 65, 51, 8, 86, 77, 19, 32, 22, 49, 47, 96, 98, 81, 35, 100, 14, 73, 83, 44, 70, 25, 91, 28, 66, 37, 59, 52, 102, 9, 87, 16, 78, 41, 75

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OFFSET

1,3

LINKS

Robert Israel, Table of n, a(n) for n = 1..10000

FORMULA

n = 6: A095810(6) = 12. k = 9 is the least nonnegative integer such that 2^k ends in 12. Therefore, a(6) = 9.

MAPLE

# assuming A095810[1]..A095810[N] are assigned

f:= proc(i) local s, v, t;

s:= msolve(2^x=A095810[i], 10^(1+ilog10(A095810[i])));

v:= indets(rhs(s[1]), name);