A136997 Numbers k such that k and k^2 use only the digits 1, 2, 4, 7 and 8.

1, 2, 11, 12, 21, 22, 28, 88, 122, 221, 278, 418, 421, 471, 472, 478, 1478, 1488, 2778, 2878, 4141, 4271, 4721, 8472, 8878, 11141, 14771, 21171, 21778, 27771, 27878, 84722, 88418, 88471, 112778, 112878, 118818, 211488, 272841, 277818, 287771, 414418, 422222, 477778, 878221, 884428, 1128222, 1214171, 1477221, 1477421, 2174278, 2178818, 2184441

Offset

1,2

Comments

Generated with DrScheme.

Links

Jonathan Wellons, Table of n, a(n) for n = 1..454

J. Wellons, Tables of Shared Digits [archived]

Example

847184817428412^2 = 717722114881211772824744841744.

Crossrefs

Sequence in context: A065020 A136986 A096109 * A085184 A037089 A038118

Adjacent sequences: A136994 A136995 A136996 * A136998 A136999 A137000

Keyword

base,nonn,changed

Author

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

Status

approved