A022460 - OEIS

A022460

a(n) = prime(3*n) mod prime(n).

1, 1, 3, 2, 3, 9, 5, 13, 11, 26, 13, 3, 3, 9, 9, 11, 56, 7, 1, 68, 15, 1, 15, 3, 88, 94, 7, 5, 13, 11, 106, 110, 112, 1, 124, 140, 136, 130, 142, 140, 140, 158, 154, 164, 170, 190, 178, 158, 172, 176, 184, 194, 214, 200, 206, 208, 212, 220, 220, 226, 244

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,3

LINKS

G. C. Greubel, Table of n, a(n) for n = 1..10000

FORMULA

a(n) = A031336(n) modulo A000040(n). - Michel Marcus, Sep 30 2013

MATHEMATICA

Table[Mod[Prime[3 n], Prime[n]], {n, 100}] (* Vincenzo Librandi, Dec 09 2014 *)

PROG

(PARI) a(n) = prime(3*n) % prime(n); \\ Michel Marcus, Sep 30 2013

(Magma) [NthPrime(3*n) mod NthPrime(n): n in [1..90]]; // Vincenzo Librandi, Dec 09 2014