A248022 Achilles numbers which are coprime to the sum of their divisors.

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

Amiram Eldar, Table of n, a(n) for n = 1..10000

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

Adjacent sequences: A248019 A248020 A248021 * A248023 A248024 A248025

Keyword

nonn,easy

Author

Robert G. Wilson v, Sep 29 2014

Status

approved