A105456 - OEIS

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A105456

Number of irregular primes less than 2^n.

0, 0, 0, 0, 0, 2, 5, 9, 28, 64, 124, 225, 408, 763, 1378, 2566, 4803, 9005, 16948, 32300, 61408, 116688, 222091 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,6`
	MATHEMATICA	`ip={ the list of irregular primes to 12 million }; Table[ Length[ Select[ip, # < 2^n &]], {n, 23}]`
	CROSSREFS	`Cf. A007053, A105460, A105465.` `Sequence in context: A094600 A139796 A086586 * A128565 A151952 A090291` `Adjacent sequences: A105453 A105454 A105455 * A105457 A105458 A105459`
	KEYWORD	`hard,nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), Apr 07 2005`

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Last modified February 14 22:54 EST 2012. Contains 205685 sequences.