A140745 - OEIS

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A140745

Smallest prime p such that p-th Mersenne number A000225(p) = M_p = 2^p - 1 has prime decomposition into exactly n factors.

2, 11, 29, 157, 113, 223, 491, 431, 397 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`1,1`
	REFERENCES	`J.-M. De Koninck, Ces nombres qui nous fascinent, Entry 223, pp 63-4, Ellipse Paris 2008.`
	LINKS	`Table of n, a(n) for n=1..9.`
	CROSSREFS	`Sequence in context: A220095 A133558 A285812 * A178629 A062802 A103830` `Adjacent sequences: A140742 A140743 A140744 * A140746 A140747 A140748`
	KEYWORD	`more,nonn`
	AUTHOR	`Lekraj Beedassy, Jul 12 2008`
	STATUS	`approved`

Last modified September 22 17:16 EDT 2020. Contains 337291 sequences. (Running on oeis4.)