A244030 Composite numbers n such that the quadratic form x^2+n*y^2 does not represent a prime strictly between n and 2n.

8, 24, 26, 35, 56, 68, 119, 120, 125, 134, 185, 194, 206, 290, 314, 326, 341, 356, 371, 404, 464, 489, 524, 545, 626, 635, 671, 698, 699, 749, 755, 815, 914, 978, 1011, 1141, 1161, 1190, 1205, 1232, 1316, 1529, 1595, 1634, 1760, 1784, 2021, 2546, 3419, 3464, 3485, 3561, 3674, 3746, 3806, 4094, 4616, 4904, 6041, 7061, 7556, 8876, 9974, 12326, 17531, 17786, 43181

Offset

1,1

Links

Table of n, a(n) for n=1..67.

William C. Jagy and Irving Kaplansky, Positive definite binary quadratic forms that represent the same primes [Cached copy]

Crossrefs

Cf. A244029, A244031.

Sequence in context: A052349 A254448 A029607 * A375432 A374590 A325990

Adjacent sequences: A244027 A244028 A244029 * A244031 A244032 A244033

Keyword

nonn

Author

N. J. A. Sloane, Jun 22 2014

Status

approved