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A126044 Exponents p of the Mersenne primes 2^p - 1 (see A000043) read mod 4. 1
2, 3, 1, 3, 1, 1, 3, 3, 1, 1, 3, 3, 1, 3, 3, 3, 1, 1, 1, 3, 1, 1, 1, 1, 1, 1, 1, 3, 3, 4, 3, 3, 1, 3, 1, 1, 1, 1, 1, 3, 3, 3, 1, 1, 3, 1, 1 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..47.

FORMULA

a(n) = A010873(A000043(n)). - Michel Marcus, Apr 07 2018

MATHEMATICA

Array[Mod[MersennePrimeExponent@ #, 4] &, 45] (* Michael De Vlieger, Apr 07 2018 *)

CROSSREFS

Cf. A126043-A126059.

Sequence in context: A064442 A287566 A134411 * A114899 A220906 A023678

Adjacent sequences:  A126041 A126042 A126043 * A126045 A126046 A126047

KEYWORD

nonn

AUTHOR

Artur Jasinski, Dec 17 2006

EXTENSIONS

a(45)-a(46) from Ivan Panchenko, Apr 07 2018

a(47) from Ivan Panchenko, Apr 09 2018

STATUS

approved

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Last modified July 12 06:48 EDT 2020. Contains 335657 sequences. (Running on oeis4.)