A137004 Numbers k such that k and k^2 use only the digits 1, 2, 5, 6 and 7.

1, 5, 11, 15, 16, 25, 26, 75, 76, 125, 165, 166, 275, 276, 511, 515, 516, 525, 526, 715, 716, 725, 1125, 1275, 1665, 1666, 2261, 2275, 2675, 5125, 5165, 7261, 7525, 11215, 11275, 12511, 12515, 12715, 16665, 16666, 25525, 25526, 25715, 25725, 26675, 26761, 27525, 51211, 72261, 72576, 125125, 125165, 125166, 125525, 125526, 127525, 161761, 165125

Offset

1,2

Comments

Generated with DrScheme.

Subsequence of A137005 and A137006. - M. F. Hasler, Jan 24 2008

Links

Jonathan Wellons, Table of n, a(n) for n = 1..774

J. Wellons, Tables of Shared Digits [archived]

Example

756156171512576^2 = 571772155716556252275726155776.

Crossrefs

Sequence in context: A171418 A213444 A314002 * A137005 A137006 A137003

Adjacent sequences: A137001 A137002 A137003 * A137005 A137006 A137007

Keyword

base,nonn,changed

Author

Jonathan Wellons (wellons(AT)gmail.com), Jan 22 2008

Status

approved