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The 2^n-th irregular prime.
2

%I #5 Mar 05 2019 08:33:43

%S 37,59,101,157,311,557,971,2111,4909,10457,23099,50359,109589,235577,

%T 506281,1065013,2249609,4745963,10010393,21030973,44070017,92079881,

%U 192011803,399771653,830692727,1724024177

%N The 2^n-th irregular prime.

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

%Y Cf. A033844, A105456, A105465.

%K hard,nonn,more

%O 1,1

%A _Robert G. Wilson v_, Apr 07 2005

%E a(19) corrected and a(20)-a(26) added by _Amiram Eldar_, Mar 05 2019