A132237 Primes congruent to {7, 23} mod 30.

7, 23, 37, 53, 67, 83, 97, 113, 127, 157, 173, 233, 263, 277, 293, 307, 337, 353, 367, 383, 397, 443, 457, 487, 503, 547, 563, 577, 593, 607, 653, 683, 727, 743, 757, 773, 787, 863, 877, 907, 937, 953, 967, 983, 997, 1013, 1087, 1103

Offset

1,1

Comments

Up to 4913, there are more primes of this form than composites. See also A132231 and A227869 (congruent to 7 only). - M. F. Hasler, Nov 02 2013

Links

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

C. K. Caldwell, The Prime Pages.

Omar E. Pol, Determinacion geometrica de los numeros primos y perfectos.

Mathematica

Select[Prime[Range[1000]], MemberQ[{7, 23}, Mod[#, 30]]&] (* Vincenzo Librandi, Aug 14 2012 *)

Prog

(Magma) [ p: p in PrimesUpTo(1300) | p mod 30 in [7, 23] ]; // Vincenzo Librandi, Aug 14 2012
(PARI) is_A132237(n)=setsearch([7, 23], n%30)&&isprime(n) \\ - M. F. Hasler, Nov 02 2013

Crossrefs

Cf. A000040, A007510, A039949, A068229, A129807.

Sequence in context: A227421 A098029 A098039 * A227064 A143030 A031043

Adjacent sequences: A132234 A132235 A132236 * A132238 A132239 A132240

Keyword

easy,nonn

Author

Omar E. Pol, Aug 15 2007

Status

approved