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A188484 Numbers n (other than powers of 2) such that abs(abundance(n)) is an odd square. 4
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 (list; graph; refs; listen; history; text; internal format)
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

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Last modified October 26 17:14 EDT 2021. Contains 348268 sequences. (Running on oeis4.)