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Exponents p of the Mersenne primes 2^p - 1 (see A000043) read mod 12.
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%I #16 Oct 15 2024 04:30:31

%S 2,3,5,7,1,5,7,7,1,5,11,7,5,7,7,7,1,1,5,7,5,5,5,5,5,1,1,11,7,1,7,11,5,

%T 7,5,5,5,5,1,7,7,11,1,5,11,1,5,5

%N Exponents p of the Mersenne primes 2^p - 1 (see A000043) read mod 12.

%F a(n) = A010881(A000043(n)). - _Ivan Panchenko_, Apr 07 2018

%t Mod[MersennePrimeExponent[Range[48]], 12] (* _Amiram Eldar_, Oct 14 2024 *)

%Y Cf. A000043, A010881, A126043-A126059.

%K nonn,more

%O 1,1

%A _Artur Jasinski_, Dec 17 2006

%E a(45)-a(47) from _Ivan Panchenko_, Apr 08 2018

%E a(48) from _Amiram Eldar_, Oct 14 2024