A141885 Primes congruent to 13 mod 20.

13, 53, 73, 113, 173, 193, 233, 293, 313, 353, 373, 433, 593, 613, 653, 673, 733, 773, 853, 953, 1013, 1033, 1093, 1153, 1193, 1213, 1373, 1433, 1453, 1493, 1553, 1613, 1693, 1733, 1753, 1873, 1913, 1933, 1973, 1993, 2053, 2113, 2153, 2213, 2273, 2293, 2333, 2393

Offset

1,1

Links

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

Formula

a(n) ~ 8n log n. - Charles R Greathouse IV, Jul 02 2016

Mathematica

Select[Range[13, 5000, 20], PrimeQ[#]&] (* Vladimir Joseph Stephan Orlovsky, Mar 31 2011*)

Prog

(Magma) [p: p in PrimesUpTo(3000) | p mod 20 eq 13 ]; // Vincenzo Librandi, Aug 16 2012
(PARI) is(n)=isprime(n) && n%20==13 \\ Charles R Greathouse IV, Jul 02 2016

Crossrefs

Cf. A000040, A105854, A141881, A141882, A141883.

Sequence in context: A076163 A207977 A056255 * A262447 A165352 A262287

Adjacent sequences: A141882 A141883 A141884 * A141886 A141887 A141888

Keyword

nonn,easy

Author

N. J. A. Sloane, Jul 11 2008

Status

approved