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A110815 Least n-digit number m whose square contains only digits not appearing in m. 2
2, 17, 144, 1447, 14144, 141494, 1414414, 14144134, 141431114, 1414411113, 14143143413, 141431113114, 1414311131114, 14143111141813, 141431113114113, 1414311344113314, 14143111141141113, 141431113114331413 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

floor(sqrt(2)*10^(n-1)) < a(n). - Robert G. Wilson v, Oct 04 2005

LINKS

Table of n, a(n) for n=1..18.

MATHEMATICA

f[n_] := Block[{k = Ceiling[10^n*(1/9 + .03032)]}, While[ Intersection[ IntegerDigits[k], IntegerDigits[k^2]] != {}, k++ ]; k]; Table[ f[n], {n, 18}] (* Robert G. Wilson v *)

CROSSREFS

Cf. A110816 (corresponding squares), A112321. Subsequence of A029783.

Sequence in context: A037741 A037636 A163066 * A273340 A074624 A245807

Adjacent sequences:  A110812 A110813 A110814 * A110816 A110817 A110818

KEYWORD

nonn,base

AUTHOR

Lekraj Beedassy, Aug 17 2005

EXTENSIONS

a(3) to a(6) corrected, a(7) to a(13) from Klaus Brockhaus, Aug 31 2005; revised Sep 09 2005

a(14)-a(18) from Robert G. Wilson v, Oct 04 2005

STATUS

approved

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Last modified May 26 19:44 EDT 2019. Contains 323597 sequences. (Running on oeis4.)