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A137109 Numbers n such that n and the square of n use only the digits 2, 4, 8 and 9. 0
2, 22, 222, 288, 49898882, 499898882 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Generated with DrScheme

No additional terms up to 10^12. - Harvey P. Dale, Oct 11 2017

LINKS

Table of n, a(n) for n=1..6.

J. Wellons, Tables of Shared Digits

EXAMPLE

499898882^2 = 249898892224849924

MATHEMATICA

With[{c={2, 4, 8, 9}}, Select[FromDigits/@Flatten[Table[Tuples[c, n], {n, 10}], 1], SubsetQ[c, IntegerDigits[#^2]]&]] (* Harvey P. Dale, Oct 11 2017 *)

CROSSREFS

Sequence in context: A239688 A037567 A174200 * A002276 A112893 A086855

Adjacent sequences:  A137106 A137107 A137108 * A137110 A137111 A137112

KEYWORD

base,nonn

AUTHOR

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

STATUS

approved

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Last modified May 31 22:45 EDT 2020. Contains 334756 sequences. (Running on oeis4.)