A137071 Numbers k such that k and k^2 use only the digits 2, 3, 4, 6 and 7.

2, 6, 26, 474, 4762, 272442, 273376, 2732632, 2764674, 27264326, 27337662, 47374332, 2724422442, 2724642442, 2763643326, 4727236262, 4737376662, 4737746644, 4772247662, 4772446262, 27247472662, 27326246426, 47246633344, 47362667432, 47377466632, 47673344474, 272463477632, 272623776426, 273363264674, 276337233762

Offset

1,1

Comments

Generated with DrScheme.

Links

Jonathan Wellons, Table of n, a(n) for n = 1..63

J. Wellons, Tables of Shared Digits [archived]

Example

473737632374332^2 = 224427344327637734663772446224.

Crossrefs

Sequence in context: A306147 A331937 A162438 * A255016 A331751 A034565

Adjacent sequences: A137068 A137069 A137070 * A137072 A137073 A137074

Keyword

base,nonn,changed

Author

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

Status

approved