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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
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
Sequence in context: A160635 A339527 A090652 * A257668 A106095 A153319
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.)