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A137111 Numbers k such that k and k^2 use only the digits 2, 5, 6, 7 and 8. 1
5, 25, 26, 75, 76, 85, 275, 525, 526, 725, 765, 766, 826, 875, 2585, 2785, 2875, 5275, 7525, 7665, 7666, 8525, 8675, 8765, 8865, 8875, 26875, 27525, 27725, 28675, 28785, 52525, 52785, 72576, 72585, 76526, 76585, 76665, 76666, 76725, 82875, 88785, 228665, 256266, 256275, 276725, 278725, 278865, 287725, 287865, 526525, 526865, 527525, 725725, 752785 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Generated with DrScheme.
LINKS
J. Wellons, Tables of Shared Digits [archived]
EXAMPLE
875686752587525^2 = 766827288657285222282785625625.
MATHEMATICA
With[{c={2, 5, 6, 7, 8}}, Select[Flatten[Table[FromDigits/@Tuples[c, n], {n, 6}]], SubsetQ[ c, IntegerDigits[#^2]]&]] (* Harvey P. Dale, Mar 14 2023 *)
CROSSREFS
Sequence in context: A037410 A070381 A136912 * A137110 A036137 A070380
KEYWORD
base,nonn
AUTHOR
Jonathan Wellons (wellons(AT)gmail.com), Jan 22 2008
STATUS
approved

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Last modified July 22 15:30 EDT 2024. Contains 374529 sequences. (Running on oeis4.)