A142821 Primes congruent to 23 mod 61.

23, 389, 877, 1487, 1609, 2341, 2707, 4049, 4903, 5147, 5879, 6367, 6733, 6977, 8563, 8807, 8929, 9173, 9539, 9661, 10271, 11003, 11369, 11491, 12101, 12589, 13687, 13931, 14419, 15761, 16127, 16249, 16493, 16981, 17713, 17957, 19421, 19543, 20641, 21617

Offset

1,1

Links

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

Formula

a(n) ~ 60n log n. - Charles R Greathouse IV, Jul 03 2016

Mathematica

Select[Prime[Range[2700]], MemberQ[{23}, Mod[#, 61]] &] (* Vincenzo Librandi, Sep 05 2012 *)
Select[Range[23, 22000, 61], PrimeQ] (* Harvey P. Dale, Jun 17 2018 *)

Prog

(Magma) [p: p in PrimesUpTo(22000) | p mod 61 eq 23 ] ; // Vincenzo Librandi, Sep 05 2012
(PARI) is(n)=isprime(n) && n%61==23 \\ Charles R Greathouse IV, Jul 03 2016

Crossrefs

Cf. A000040.

Sequence in context: A014926 A353117 A016267 * A245805 A016197 A199821

Adjacent sequences: A142818 A142819 A142820 * A142822 A142823 A142824

Keyword

nonn,easy

Author

N. J. A. Sloane, Jul 11 2008

Status

approved