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

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

Offset: 1

Author

Patrick De Geest

Keywords

• nonn
• base

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 in bases 2 to 17
• 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.

Crossrefs

Cf. A027679.

Formula

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

Extensions

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

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