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A105461 The floor(exp(n))-th irregular prime. 2
37, 59, 149, 389, 809, 2543, 8089, 25301, 76493, 232439, 695407, 2040551, 5993249, 17532407, 50970511, 147468721, 424835869, 1219642051 (list; graph; refs; listen; history; text; internal format)
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 A168006

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

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Last modified April 15 20:40 EDT 2021. Contains 342977 sequences. (Running on oeis4.)