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A066227 Number of digits in Mersenne primes with a prime number of digits. 0
2, 3, 19, 157, 2917 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

EXAMPLE

a(4) is M21, the 21st Mersenne prime with prime digit count of 2917

CROSSREFS

Cf. A028335.

Sequence in context: A072877 A201378 A032329 * A061490 A048827 A032077

Adjacent sequences:  A066224 A066225 A066226 * A066228 A066229 A066230

KEYWORD

nonn,base

AUTHOR

Enoch Haga (Enokh(AT)comcast.net), Dec 18 2001

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Last modified February 15 10:06 EST 2012. Contains 205763 sequences.