A105462 The 3^n-th irregular prime.

37, 67, 233, 467, 1307, 4637, 15601, 54437, 184279, 616391, 2009011, 6568151, 21341821, 68826689, 220682383, 704456869

Offset: 1

Author

Robert G. Wilson v, Apr 07 2005

Keywords

• hard
• nonn

Crossrefs

Cf. A038833, A105458, A105467.

Programs

Mathematica

ip={ the list of irregular primes to 12 million }; Table[ ip[[3^n]], {n, 0, 11}]

Extensions

a(12) corrected and a(13)-a(17) added by Amiram Eldar, Mar 05 2019