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 A126043 Exponents p of the Mersenne primes 2^p - 1 (see A000043) read mod 3. 18
 2, 0, 2, 1, 1, 2, 1, 1, 1, 2, 2, 1, 2, 1, 1, 1, 1, 1, 2, 1, 2, 2, 2, 2, 2, 1, 1, 2, 1, 1, 1, 2, 2, 1, 2, 2, 2, 2, 1, 1, 1, 2, 1, 2, 2, 1, 2 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS FORMULA a(n) = A010872(A000043(n)). - Michel Marcus, Aug 12 2014 MATHEMATICA Array[Mod[MersennePrimeExponent@ #, 3] &, 45] (* Michael De Vlieger, Apr 07 2018 *) PROG (PARI) forprime(p=1, 1e3, if(isprime(2^p-1), print1(p%3, ", "))) \\ Felix FrÃ¶hlich, Aug 12 2014 CROSSREFS Cf. A010872 (n mod 3), A126044-A126059. Sequence in context: A104450 A281460 A035226 * A306659 A191225 A223893 Adjacent sequences:  A126040 A126041 A126042 * A126044 A126045 A126046 KEYWORD nonn AUTHOR Artur Jasinski, Dec 17 2006 EXTENSIONS a(45)-a(47) from Ivan Panchenko, Apr 08 2018 STATUS approved

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Last modified February 26 09:05 EST 2020. Contains 332277 sequences. (Running on oeis4.)