A244380 Numbers k such that 1 + k + k^3 + k^5 + k^7 + k^9 + ... + k^25 is prime.

48, 136, 172, 198, 222, 388, 718, 802, 844, 966, 1342, 1356, 1488, 1542, 1668, 1708, 1734, 1780, 1956, 2008, 2082, 2316, 2356, 2394, 2422, 2536, 2734, 2844, 2880, 2916, 2974, 2982, 3024, 3120, 3258, 3364, 3562, 3664, 3906, 3930, 4308, 4312, 4554, 4566

Offset

1,1

Links

Vincenzo Librandi, Table of n, a(n) for n = 1..700

Mathematica

Select[Range[6000], PrimeQ[Total[#^Range[1, 25, 2]] + 1] &]

Prog

(Magma) [n: n in [0..5500] | IsPrime(s) where s is 1+&+[n^i: i in [1..25 by 2]]];

Crossrefs

Cf. similar sequences listed in A244376.

Sequence in context: A118145 A260833 A260972 * A260493 A003502 A129428

Adjacent sequences: A244377 A244378 A244379 * A244381 A244382 A244383

Keyword

nonn,easy

Author

Vincenzo Librandi, Jun 27 2014

Status

approved