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A185817 Smallest m such that n is a prefix of 101^m in its decimal representation. 2
0, 70, 111, 140, 162, 181, 196, 209, 221, 1, 10, 19, 27, 34, 41, 48, 54, 60, 65, 70, 75, 80, 84, 88, 93, 97, 100, 104, 108, 111, 114, 117, 120, 123, 126, 129, 132, 135, 137, 140, 142, 145, 147, 149, 152, 154, 156, 158, 160, 162, 164, 166, 168, 170, 172, 174, 175, 177, 179, 181 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
a(n) = MIN{e: floor(A096884(e)/10^k) = n for some k;
a(n) <= a(10*n + d), 0 <= d < 10.
LINKS
EXAMPLE
a(1) = 0; a(10) = 1; a(101) = 1;
a(2) = 70, as A000030(101^e) = 1 for e < 70 and A000030(101^70) = 2,
101^70=2006763368395383712973746195325904225117468781576180838692428661200863034768\
95435690179367146267108054577096030854694073677909106884264157001.
PROG
(Haskell)
import Data.List (isPrefixOf)
a185817 n = pref101pow 0 1 where
pref101pow e pow101 = if isPrefixOf (show n) (show pow101)
then e
else pref101pow (e + 1) (101 * pow101)
CROSSREFS
Sequence in context: A117350 A004239 A357670 * A260573 A224672 A039542
KEYWORD
nonn,base,look
AUTHOR
Reinhard Zumkeller, Feb 07 2011
STATUS
approved

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Last modified April 17 04:14 EDT 2024. Contains 371756 sequences. (Running on oeis4.)