A124410 Numbers k such that 2k+1, 4k+1, 6k+1, 8k+1 and 10k+1 are primes.

5415, 12705, 13020, 44370, 82950, 98280, 105525, 112200, 115140, 123855, 134250, 134460, 187740, 188745, 210165, 225705, 247170, 256410, 296310, 302085, 367875, 375645, 382890, 399585, 404040, 476340, 487830, 526845, 532095, 566430, 578085

Offset

1,1

Links

Jinyuan Wang, Table of n, a(n) for n = 1..1000

Mathematica

Select[Range[600000], And @@ PrimeQ /@ ({2, 4, 6, 8, 10}*# + 1) &] (* Ray Chandler, Nov 20 2006 *)

Prog

(PARI) is(k) = sum(j = 1, 5, isprime(2*j*k+1)) == 5; \\ Jinyuan Wang, Aug 04 2019

Crossrefs

Cf. A005097, A005098, A024899, A005123, A024912, A123998, A124408, A124409, A124411, A071576.

Sequence in context: A035902 A203711 A105654 * A211775 A346177 A363782

Adjacent sequences: A124407 A124408 A124409 * A124411 A124412 A124413

Keyword

nonn

Author

Artur Jasinski, Oct 31 2006

Status

approved