1,6

A googolplex is 10^(10^100). a(n) = 0 iff n = 2^a * 5^b, a, b >= 0 (A003592).

Daniel Starodubtsev, Table of n, a(n) for n = 1..10000

Eric Weisstein's World of Mathematics, Googolplex

Table[ PowerMod[10, 10^100, n], {n, 2, 50}]

Cf. A066298.

Sequence in context: A075866 A202168 A156450 * A066298 A108068 A283998

Adjacent sequences: A067004 A067005 A067006 * A067008 A067009 A067010

nonn

Ed Pegg Jr, Nov 20 2002

Edited by Robert G. Wilson v, Nov 23 2002

approved