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A141885 Primes congruent to 13 mod 20. 4
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 (list; graph; refs; listen; history; text; internal format)
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

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Last modified January 29 07:03 EST 2020. Contains 331337 sequences. (Running on oeis4.)