A188484 Numbers n (other than powers of 2) such that abs(abundance(n)) is an odd square.

98, 2116, 4232, 49928, 80656, 140450, 550564, 729632, 1667138, 2666689, 8853632, 9210632, 12380288, 15038884, 37810208, 57365476, 108103808, 155725952, 197686728, 247397768, 257859364, 327782408, 398353538, 544236032, 775864832

Offset

1,1

Comments

Superset of Kravitz conjecture counterexamples (A188486). Abundances of these numbers are A188487.

Links

Giovanni Resta, Table of n, a(n) for n = 1..226 (terms < 10^24, first 36 terms from Donovan Johnson)

Eric Weisstein's World of Mathematics, Kravitz Conjecture

Crossrefs

Cf. A188486, A188487.

Sequence in context: A197616 A022149 A128801 * A271037 A243477 A178974

Adjacent sequences: A188481 A188482 A188483 * A188485 A188486 A188487

Keyword

nonn,hard

Author

Eric W. Weisstein, Apr 01 2011

Extensions

a(17)-a(25) from D. S. McNeil, Apr 02 2011

Status

approved