A242121 Primes modulo 21.

2, 3, 5, 7, 11, 13, 17, 19, 2, 8, 10, 16, 20, 1, 5, 11, 17, 19, 4, 8, 10, 16, 20, 5, 13, 17, 19, 2, 4, 8, 1, 5, 11, 13, 2, 4, 10, 16, 20, 5, 11, 13, 2, 4, 8, 10, 1, 13, 17, 19, 2, 8, 10, 20, 5, 11, 17, 19, 4, 8, 10, 20, 13, 17, 19, 2, 16, 1, 11, 13, 17, 2, 10

Offset

1,1

Links

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

Mathematica

Mod[Prime[Range[100]], 21]

Prog

(Magma) [p mod(21): p in PrimesUpTo(500)];
(PARI) a(n) = prime(n) % 21; \\ Michel Marcus, May 05 2014
(Sage) [mod(p, 21) for p in primes(500)] # Bruno Berselli, May 05 2014

Crossrefs

Cf. similar sequences listed in A242119.

Sequence in context: A229786 A242122 A074721 * A242120 A259277 A152073

Adjacent sequences: A242118 A242119 A242120 * A242122 A242123 A242124

Keyword

nonn,easy

Author

Vincenzo Librandi, May 05 2014

Status

approved