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A105466
Number of irregular primes less than or equal to the m-th prime, where m = floor(exp(n)).
2
0, 0, 3, 9, 58, 160, 440, 1166, 3202, 8656, 23475, 64194, 174557, 473592, 1286383, 3495241, 9501807, 25833916
OFFSET
1,3
COMMENTS
Limit_{n->inf.} a(n)/e^n = 1-e^(-1/2).
MATHEMATICA
ip={ the list of irregular primes to 12 million }; Table[ Length[ Select[ip, # < Prime[Floor[E^n]] &]], {n, 10}]
CROSSREFS
KEYWORD
hard,nonn,more
AUTHOR
Robert G. Wilson v, Apr 07 2005
EXTENSIONS
Definition clarified by N. J. A. Sloane, Jan 19 2009
Data corrected and a(11)-a(18) added by Amiram Eldar, Mar 05 2019
STATUS
approved