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Exponents p of the Mersenne primes 2^p - 1 (see A000043) read mod 16.
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%I #16 Oct 15 2024 04:32:29

%S 2,3,5,7,13,1,3,15,13,9,11,15,9,15,15,11,9,1,13,7,9,5,13,1,5,9,1,3,7,

%T 1,11,7,9,11,13,13,1,1,5,11,7,7,9,1,11,9,1,9

%N Exponents p of the Mersenne primes 2^p - 1 (see A000043) read mod 16.

%F a(n) = A130909(A000043(n)). - _Michel Marcus_, Apr 07 2018

%t Mod[MersennePrimeExponent[Range[48]], 16] (* _Amiram Eldar_, Oct 15 2024 *)

%Y Cf. A000043, A130909, 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 15 2024