A105467 - OEIS

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A105467

Number of irregular primes less than or equal to the 3^n-th prime.

0, 0, 4, 22, 91, 286, 862, 2576, 7716 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,3`
	COMMENTS	`Limit_{n->inf.} a(n)/3^n = 1-e^(-1/2).`
	MATHEMATICA	`ip={ the list of irregular primes to 12 million }; Table[ Length[ Select[ip, # < Prime[3^n] &]], {n, 9}]`
	CROSSREFS	`Cf. A105458, A105462.` `Sequence in context: A096167 A060453 A038382 * A027074 A036922 A036926` `Adjacent sequences: A105464 A105465 A105466 * A105468 A105469 A105470`
	KEYWORD	`hard,nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), Apr 07 2005`

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Last modified February 16 10:53 EST 2012. Contains 205904 sequences.