A142601 Primes congruent to 1 mod 55.

331, 661, 881, 991, 1321, 1871, 2311, 2531, 2861, 2971, 3191, 3301, 3631, 3851, 4621, 4951, 5171, 5281, 5501, 6271, 6491, 7151, 7481, 7591, 8581, 9241, 9461, 9791, 9901, 10781, 10891, 11551, 12101, 12211, 12541, 13421, 13751, 14081, 14411, 14741, 14851

Offset

1,1

Links

Vincenzo Librandi, Table of n, a(n) for n = 1..1000

Formula

a(n) ~ 40n log n. - Charles R Greathouse IV, Jul 04 2016

Mathematica

Select[Prime[Range[2500]], MemberQ[{1}, Mod[#, 55]] &] (* Vincenzo Librandi, Aug 30 2012 *)

Prog

(Magma) [p: p in PrimesUpTo(16000) | p mod 55 eq 1]; // Vincenzo Librandi, Aug 30 2012
(PARI) is(n)=isprime(n) && n%55==1 \\ Charles R Greathouse IV, Jul 04 2016

Crossrefs

Cf. A000040.

Sequence in context: A248535 A142763 A020373 * A210534 A210511 A142824

Adjacent sequences: A142598 A142599 A142600 * A142602 A142603 A142604

Keyword

nonn,easy

Author

N. J. A. Sloane, Jul 11 2008

Status

approved