A105460 The 2^n-th irregular prime.

37, 59, 101, 157, 311, 557, 971, 2111, 4909, 10457, 23099, 50359, 109589, 235577, 506281, 1065013, 2249609, 4745963, 10010393, 21030973, 44070017, 92079881, 192011803, 399771653, 830692727, 1724024177

Offset

1,1

Links

Table of n, a(n) for n=1..26.

Mathematica

ip={ the list of irregular primes to 12 million }; Table[ ip[[2^n]], {n, 0, 18}]

Crossrefs

Cf. A033844, A105456, A105465.

Sequence in context: A000928 A073276 A281290 * A141851 A105461 A288617

Adjacent sequences: A105457 A105458 A105459 * A105461 A105462 A105463

Keyword

hard,nonn,more

Author

Robert G. Wilson v, Apr 07 2005

Extensions

a(19) corrected and a(20)-a(26) added by Amiram Eldar, Mar 05 2019

Status

approved