A027678 Squares composed of digits {2,4,8}.

4, 484, 28224, 228484, 8282884, 44484284288828484, 244848282488224248488284224, 2284884224228428242888448884484, 42884424422284228884248482424484, 448424228448248888288442822222282244, 424242448424484484244824228422488282244

Offset

1,1

References

Ilan Vardi, Computational Recreations in Mathematica, Chapter 2, Exercise 2.2.

Links

Zhao Hui Du, Table of n, a(n) for n = 1..15

Patrick De Geest, Squares containing at most three distinct digits, Index entries for related sequences.

Patrick De Geest, Palindromic Squares.

H. Mishima, Sporadic tridigital solutions.

A. Ottens, The arithmetic-digits-squares-three.digits problem.

T. Sillke, What square consists entirely of three digits(e.g. 2,4 and 8)?

Eric Weisstein's World of Mathematics, Square Number.

Formula

a(n) = A027679(n)^2.

Crossrefs

Cf. A027679.

Sequence in context: A053292 A053963 A053941 * A058442 A221242 A075411

Adjacent sequences: A027675 A027676 A027677 * A027679 A027680 A027681

Keyword

nonn,base

Author

Patrick De Geest

Extensions

One more term from Jon E. Schoenfield, Sep 04 2006

More terms from Mishima's page added by Max Alekseyev, Jan 28 2012

Status

approved