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 A062675 Every divisor (except 1) contains the digit 7. 18
 7, 17, 37, 47, 67, 71, 73, 79, 97, 107, 127, 137, 157, 167, 173, 179, 197, 227, 257, 271, 277, 307, 317, 337, 347, 367, 373, 379, 397, 457, 467, 479, 487, 497, 547, 557, 571, 577, 587, 607, 617, 647, 673, 677, 679, 701, 709, 719, 727, 733, 739, 743, 749, 751 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Amiram Eldar, Table of n, a(n) for n = 1..10000 EXAMPLE 799 has divisors 17, 47 and 799, all of which contain the digit 7. MATHEMATICA fQ[n_, dgt_] := Union[ MemberQ[#, dgt] & /@ IntegerDigits@ Rest@ Divisors@ n][[1]]; Select[ Range[2, 760], fQ[#, 7] &] (* Robert G. Wilson v, Jun 11 2014 *) PROG (Magma) [k:k in [2..800]| forall{d:d in Set(Divisors(k)) diff {1}| 7 in Intseq(d)}]; // Marius A. Burtea, Nov 07 2019 CROSSREFS Cf. A062653, A062664, A062667, A062668, A062669, A062670, A062671, A062672, A062673, A062674, A062676, A062677, A062678, A062679, A062680. Sequence in context: A160635 A339527 A090652 * A257668 A106095 A153319 Adjacent sequences: A062672 A062673 A062674 * A062676 A062677 A062678 KEYWORD nonn,base,easy AUTHOR Erich Friedman, Jul 04 2001 STATUS approved

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Last modified July 23 09:37 EDT 2024. Contains 374547 sequences. (Running on oeis4.)