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A136912 Numbers k such that k and k^2 use only the digits 0, 2, 5, 6 and 7. 1
0, 5, 25, 26, 50, 75, 76, 225, 250, 255, 260, 265, 266, 275, 500, 505, 525, 526, 725, 726, 750, 755, 760, 775, 2250, 2500, 2505, 2550, 2600, 2650, 2660, 2750, 2766, 2775, 5000, 5005, 5025, 5026, 5050, 5075, 5076, 5250, 5260, 5265, 7075, 7225, 7250, 7260, 7500, 7525, 7550, 7600, 7750, 22500, 25000, 25005, 25025, 25050, 25500, 25505, 26000, 26005, 26500 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Generated with DrScheme.
LINKS
J. Wellons, Tables of Shared Digits [archived]
EXAMPLE
756706725^2 = 572605067660225625.
MATHEMATICA
Select[FromDigits/@Tuples[{0, 2, 5, 6, 7}, 5], And@@Table[MemberQ[{0, 2, 5, 6, 7}, n], {n, IntegerDigits[#^2]}]&] (* Harvey P. Dale, Nov 19 2013 *)
With[{c={0, 2, 5, 6, 7}}, Select[FromDigits/@Tuples[c, 5], SubsetQ[c, IntegerDigits[ #^2]]&]] (* Harvey P. Dale, Mar 14 2023 *)
CROSSREFS
Sequence in context: A137112 A037410 A070381 * A137111 A137110 A036137
KEYWORD
base,nonn
AUTHOR
Jonathan Wellons (wellons(AT)gmail.com), Jan 22 2008
STATUS
approved

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Last modified June 21 06:22 EDT 2024. Contains 373540 sequences. (Running on oeis4.)