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A141898
Primes congruent to 20 mod 21.
3
41, 83, 167, 251, 293, 419, 461, 503, 587, 797, 839, 881, 1049, 1091, 1217, 1259, 1301, 1427, 1511, 1553, 1637, 1721, 1847, 1889, 1931, 1973, 2099, 2141, 2267, 2309, 2351, 2393, 2477, 2687, 2729, 2897, 2939, 3023, 3191, 3359, 3527, 3779, 3821, 3863, 3947
OFFSET
1,1
LINKS
FORMULA
a(n) ~ 12n log n. - Charles R Greathouse IV, Jul 02 2016
MATHEMATICA
Select[Range[20, 5000, 21], PrimeQ] (* Vladimir Joseph Stephan Orlovsky, Apr 04 2011*)
PROG
(Magma) [ p: p in PrimesUpTo(5000) | p mod 21 eq 20 ]; // Vincenzo Librandi, Apr 05 2011
(PARI) is(n)=isprime(n) && n%21==20 \\ Charles R Greathouse IV, Jul 02 2016
(GAP) A141898:=Filtered(Filtered([1..10^3], IsPrime), i-> i mod 21 = 20); # Muniru A Asiru, Oct 09 2017
CROSSREFS
Sequence in context: A173550 A136072 A098061 * A054998 A067378 A331031
KEYWORD
nonn,easy
AUTHOR
N. J. A. Sloane, Jul 11 2008
STATUS
approved