A248400 Noncongruent squarefree numbers n with A248394(n)/d(n) = -2, where d(n) = A000005(n).

17, 89, 97, 193, 217, 233, 259, 305, 377, 401, 449, 481, 497, 617, 667, 713, 745, 769, 897, 929, 955, 977, 979, 1009, 1011, 1027, 1033, 1049, 1065, 1337, 1345, 1355, 1385, 1409, 1417, 1489, 1507, 1555, 1739, 1769, 1771, 1801, 1803, 1817, 1921, 1945, 2001, 2019

Offset: 1

Author

N. J. A. Sloane, Oct 20 2014

Keywords

• nonn

Links

• J. B. Tunnell, A classical Diophantine problem and modular forms of weight 3/2, Invent. Math., 72 (1983), 323-334.

Crossrefs

Cf. A000005, A003273, A248394, A248395, A248397-A248406.

Extensions

More terms from Amiram Eldar, Oct 13 2019