S000318


Numbers n such that 2n+1, 2n+3, 2n+7, 2n+9, and 2n+13 are prime.

2, 5, 50, 740, 8030, 9710, 10505, 11135, 21890, 27665, 72080, 82850, 83420, 97865, 100910, 112670, 123800, 134405, 163070, 173990, 180605, 198875, 232580, 259400, 268220, 316730, 316895, 330545, 384095, 397895, 414860, 428975, 438005, 479270, 504425, 511250

1

S000318

Note that these numbers are a subset of S000317. The sequene of offsets (1, 3, 7, 9, 13) are the initial terms of A020497It is conjectured that this sequence is infinite.

T. D. Noe, Plot of 1000 terms

T. D. Noe, Table of 1000 terms

(Mma) Select[Range[600000], And @@ PrimeQ /@ ({1, 3, 7, 9, 13} + 2*#) &]

Cf. A020497A243811S000314-S000321.

nonn

T. D. Noe, Nov 05 2014

© Tony D Noe 2014-2015