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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. 1
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

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