A031336 a(n) = prime(3*n).

5, 13, 23, 37, 47, 61, 73, 89, 103, 113, 137, 151, 167, 181, 197, 223, 233, 251, 269, 281, 307, 317, 347, 359, 379, 397, 419, 433, 449, 463, 487, 503, 523, 557, 571, 593, 607, 619, 643, 659, 677, 701, 727, 743, 761, 787, 811, 827, 853, 863, 883, 911

Offset: 1

Author

Jeff Burch

Keywords

• nonn
• easy

Links

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

Crossrefs

Cf. similar sequences listed in A246929.

Programs

Magma

[NthPrime(3*n): n in [1..60] ]; // Vincenzo Librandi, Apr 11 2011

Maple

ithprime(3*n)

Mathematica

Table[Prime[3 n], {n, 100}] (* Vincenzo Librandi, May 07 2014 *)

PARI

a(n)=prime(3*n) \\ Charles R Greathouse IV, Jul 25 2024

Sage

[nth_prime(3*n) for n in (1..60)] # Bruno Berselli, May 07 2014

Formula

a(n) ~ 3n log n. - Charles R Greathouse IV, Jul 25 2024

Extensions

Corrected by Zak Seidov, Feb 01 2006