A058460 Squares composed of digits {2,4,7}.

4, 7744, 7744424444247727742724, 2222747424244722424422447477474724

Offset

1,1

Links

Table of n, a(n) for n=1..4.

P. De Geest, Index to related sequences

Hisanori Mishima, Sporadic tridigital solutions

Crossrefs

Cf. A058459.

Sequence in context: A058440 A058464 A053951 * A115050 A072724 A116271

Adjacent sequences: A058457 A058458 A058459 * A058461 A058462 A058463

Keyword

nonn,base,hard,more

Author

Patrick De Geest, Nov 15 2000

Status

approved