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 A242121 Primes modulo 21. 2
 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 (list; graph; refs; listen; history; text; internal format)
 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

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Last modified July 31 18:30 EDT 2021. Contains 346376 sequences. (Running on oeis4.)