A260559 Numbers k such that (k^31+1)/(k+1) is prime.

2, 6, 10, 36, 65, 74, 78, 83, 106, 115, 120, 148, 161, 163, 168, 176, 189, 194, 197, 266, 270, 288, 331, 385, 399, 407, 410, 412, 413, 431, 468, 513, 524, 546, 569, 572, 578, 581, 600, 611, 625, 626, 647, 719, 723, 756, 832, 834, 849, 922, 986, 1006, 1007, 1047

Offset

1,1

Links

Tim Johannes Ohrtmann, Table of n, a(n) for n = 1..10000

Mathematica

Select[Range[1, 10000], PrimeQ[(#^31 + 1)/(# + 1)] &]

Prog

(PARI) for(n=1, 10000, if(isprime((n^31+1)/(n+1)), print1(n, ", ")))
(Magma) [n: n in [1..10000] |IsPrime((n^31 + 1) div (n + 1))];

Crossrefs

Cf. A055494, A246392, A250174, A250178, A250181, A250185, A250187, A250193, A260558, A260560-A260573.

Sequence in context: A118039 A218965 A248821 * A258079 A027165 A111414

Adjacent sequences: A260556 A260557 A260558 * A260560 A260561 A260562

Keyword

nonn

Author

Tim Johannes Ohrtmann, Jul 29 2015

Status

approved