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A248022
Achilles numbers which are coprime to the sum of their divisors.
1
392, 800, 968, 1352, 2312, 2888, 3087, 3267, 3872, 4232, 5408, 6075, 6125, 6272, 6728, 7688, 7803, 9248, 10952, 11552, 12800, 13448, 14283, 14792, 15125, 15488, 16928, 17672, 19208, 20000, 21632, 22472, 22707, 25088, 26912, 27783, 27848, 29403, 29768, 30752, 33275
OFFSET
1,1
LINKS
MATHEMATICA
achillesQ[n_] := Block[{ls = Last /@ FactorInteger@ n}, Min@ ls > 1 == GCD @@ ls]; Select[ Range@ 35000, achillesQ[ #] && GCD[#, DivisorSigma[1, #]] == 1 &]
CROSSREFS
Intersection of A052486 and A003624. - Michel Marcus, Sep 30 2014
Sequence in context: A187724 A035883 A235188 * A261379 A235313 A203917
KEYWORD
nonn,easy
AUTHOR
Robert G. Wilson v, Sep 29 2014
STATUS
approved