A137058 Numbers n such that n and the square of n use only the digits 1, 4, 7, 8 and 9.

1, 7, 9, 88, 141, 441, 1191, 4141, 4471, 8878, 8941, 9191, 84779, 87988, 94191, 97441, 99471, 118817, 414417, 847891, 974417, 989891, 994479, 4179891, 4181488, 4181971, 9171417, 9187917, 9191191, 9478817, 9974417, 9974878, 11914191, 44718988, 84778817, 84784891, 91911478, 91919471, 94419141, 99447417, 848418988, 884188878

Offset

1,2

Comments

Generated with DrScheme

Links

Jonathan Wellons, Table of n, a(n) for n=1..205

J. Wellons, Tables of Shared Digits [archived]

Example

894141979747891^2 = 799489879947477919191918947881

Crossrefs

Sequence in context: A106132 A285011 A317401 * A116237 A123746 A152551

Adjacent sequences: A137055 A137056 A137057 * A137059 A137060 A137061

Keyword

base,nonn

Author

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

Status

approved