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A136831 Numbers n such that n and the square of n use only the digits 0, 1, 2 and 7. 3
0, 1, 10, 11, 100, 101, 110, 1000, 1001, 1010, 1011, 1100, 1101, 10000, 10001, 10010, 10011, 10100, 10110, 11000, 11001, 11010, 100000, 100001, 100010, 100011, 100100, 100101, 100110, 101000, 101001, 101100, 110000, 110001, 110010, 110100, 1000000, 1000001, 1000010, 1000011, 1000100, 1000101, 1000110, 1001000, 1001010, 1001100, 1010000 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Generated with DrScheme

LINKS

Jonathan Wellons, Table of n, a(n) for n=1..1361

J. Wellons, Tables of Shared Digits

EXAMPLE

110100010001011^2 = 12122012202222722220221022121

MATHEMATICA

With[{c={0, 1, 2, 7}}, Select[FromDigits/@Tuples[c, 7], SubsetQ[ c, IntegerDigits[ #^2]]&]] (* Harvey P. Dale, Dec 21 2014 *)

CROSSREFS

Sequence in context: A136808 A136836 A136827 * A204009 A043681 A234472

Adjacent sequences:  A136828 A136829 A136830 * A136832 A136833 A136834

KEYWORD

base,nonn

AUTHOR

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

STATUS

approved

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Last modified March 28 07:59 EDT 2020. Contains 333079 sequences. (Running on oeis4.)