A105461 The floor(exp(n))-th irregular prime.

37, 59, 149, 389, 809, 2543, 8089, 25301, 76493, 232439, 695407, 2040551, 5993249, 17532407, 50970511, 147468721, 424835869, 1219642051

Offset

1,1

Links

Table of n, a(n) for n=1..18.

Formula

a(n) = A000928(A000149(n)). - Amiram Eldar, Mar 05 2019

Mathematica

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

Crossrefs

Cf. A000928, A000149, A055739, A105457, A105466.

Sequence in context: A281290 A105460 A141851 * A288617 A032627 A357955

Adjacent sequences: A105458 A105459 A105460 * A105462 A105463 A105464

Keyword

hard,nonn,more

Author

Robert G. Wilson v, Apr 07 2005

Extensions

a(13) corrected and a(14)-a(18) added by Amiram Eldar, Mar 05 2019

Status

approved