

A113023


Number of terms in A095810 which have n digits.


2




OFFSET

1,1


COMMENTS

a(n+1)/a(n) = ~5.


LINKS

Table of n, a(n) for n=1..10.


FORMULA

t = sorted union of 2^k (mod 10^n), 0<k<=5^n; then count only those which have n digits.


MATHEMATICA

Do[t = Union[ Table[ PowerMod[2, i, 10^n], {i, 5^n}]]; Print[ Length[ Select[t, Floor[ Log[10, # ] + 1] == n &]]], {n, 10}] (* Robert G. Wilson v, Aug 27 2004 *)


CROSSREFS

Cf. A095810, A113022.
Sequence in context: A185652 A009305 A097574 * A174082 A188329 A165962
Adjacent sequences: A113020 A113021 A113022 * A113024 A113025 A113026


KEYWORD

nonn,base


AUTHOR

Paul D. Hanna and Robert G. Wilson v, Aug 27 2004


STATUS

approved



