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A045326 Primes congruent to {2, 3} mod 4. 13
2, 3, 7, 11, 19, 23, 31, 43, 47, 59, 67, 71, 79, 83, 103, 107, 127, 131, 139, 151, 163, 167, 179, 191, 199, 211, 223, 227, 239, 251, 263, 271, 283, 307, 311, 331, 347, 359, 367, 379, 383, 419, 431, 439, 443, 463, 467, 479, 487, 491, 499, 503, 523, 547, 563, 571, 587, 599, 607, 619 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Apart from initial term 2, same as A002145 (primes of the form 4k+3).

Primes not in A002144. - Juri-Stepan Gerasimov, Oct 16 2010

LINKS

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

FORMULA

a(n) ~ 2n log n. - Charles R Greathouse IV, Dec 11 2016

MATHEMATICA

Select[Prime[Range[120]], MemberQ[{2, 3}, Mod[#, 4]] &] (* Vladimir Joseph Stephan Orlovsky, Feb 18 2012 *)

PROG

(MAGMA) [p: p in PrimesUpTo(740) | p mod 4 in [2, 3]] // Vincenzo Librandi, Dec 18 2010

(PARI) is(n)=n%4>1 && isprime(n) \\ Charles R Greathouse IV, Dec 11 2016

CROSSREFS

Sequence in context: A108541 A038937 A092940 * A214029 A195602 A105897

Adjacent sequences:  A045323 A045324 A045325 * A045327 A045328 A045329

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane

STATUS

approved

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Last modified October 15 10:15 EDT 2019. Contains 328026 sequences. (Running on oeis4.)