A248401 Noncongruent squarefree numbers n with A248394(n)/d(n) = 3, where d(n) = A000005(n).

43, 131, 163, 417, 491, 537, 571, 619, 849, 913, 923, 1019, 1187, 1203, 1579, 1641, 1707, 1747, 1779, 1835, 1843, 1907, 2003, 2051, 2123, 2203, 2227, 2235, 2315, 2537, 2563, 2649, 2747, 2787, 2913, 2931, 3083, 3107, 3307, 3345, 3363, 3561, 3587, 3611, 3651, 3659

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, A165564, A248394, A248395, A248397-A248407.

Extensions

More terms from Amiram Eldar, Oct 13 2019