A055003 a(n) = prime(prime(n)-1).

2, 3, 7, 13, 29, 37, 53, 61, 79, 107, 113, 151, 173, 181, 199, 239, 271, 281, 317, 349, 359, 397, 421, 457, 503, 541, 557, 577, 593, 613, 701, 733, 769, 787, 857, 863, 911, 953, 983, 1021, 1061, 1069, 1151, 1163, 1193, 1213, 1291, 1399, 1429

Offset: 1

Author

N. J. A. Sloane, Jun 10 2000

Keywords

• nonn

Crossrefs

Cf. A000040, A008578.

Programs

Maple

with(numtheory): [seq(ithprime(ithprime(i)-1),i=1..70)];

PARI

a(n) = prime(prime(n)-1); \\ Michel Marcus, Aug 08 2017