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 A257086 Numbers n such that the decimal expansions of both n and n^2 only use the digits 0..5. 3
 0, 1, 2, 5, 10, 11, 12, 15, 20, 21, 32, 35, 45, 50, 55, 100, 101, 102, 105, 110, 111, 112, 115, 120, 145, 150, 152, 155, 200, 201, 205, 210, 211, 235, 320, 321, 332, 335, 350, 351, 450, 451, 452, 500, 501, 502, 505, 550, 1000, 1001, 1002, 1005, 1010, 1011, 1012, 1015, 1020, 1021, 1050, 1055, 1100 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 LINKS Danny Rorabaugh, Table of n, a(n) for n = 1..5000 EXAMPLE 115 is in the list because 115 and 115^2 = 13225 do not use the digits 6, 7, 8, or 9. 121 is not in the list because 121^2 = 14641 uses the digit 6. 149 is not in the list because it uses the digit 9 (even though 149^2 = 22201 would be okay). MATHEMATICA Select[Range@ 1100, Total@ Take[DigitCount[#], {6, 9}] == 0 && Total@ Take[DigitCount[#^2], {6, 9}] == 0 &] (* Michael De Vlieger, Apr 17 2015 *) CROSSREFS Cf. A178501 (0..1), A136808(0..2), A136809(0..3), A136810 (0..4), A257085 (0..6). Cf. A136817, A256631. Sequence in context: A123466 A144793 A140707 * A136817 A140180 A175324 Adjacent sequences: A257083 A257084 A257085 * A257087 A257088 A257089 KEYWORD nonn,easy,base AUTHOR Danny Rorabaugh, Apr 15 2015 STATUS approved

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Last modified September 16 14:29 EDT 2024. Contains 375976 sequences. (Running on oeis4.)