A105468 - OEIS

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A105468

Number of irregular primes less than or equal to the 10^n-th prime.

0, 29, 391, 3935, 39400 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	COMMENTS	`Limit_{n->inf.} a(n)/10^n -> 1-e^(-1/2).`
	MATHEMATICA	`ip={ the list of irregular primes to 12 million }; Table[ Length[ Select[ip, # < Prime[10^n] &]], {n, 5}]`
	CROSSREFS	`Cf. A105463.` `Sequence in context: A125441 A142756 A142327 * A160298 A077508 A077514` `Adjacent sequences: A105465 A105466 A105467 * A105469 A105470 A105471`
	KEYWORD	`hard,nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), Apr 07 2005`

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Last modified February 17 00:09 EST 2012. Contains 205978 sequences.