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A139291 (2^(2p - 1)/4)-1, where p is the n-th prime. 7

%I

%S 1,7,127,2047,524287,8388607,2147483647,34359738367,8796093022207,

%T 36028797018963967,576460752303423487,2361183241434822606847,

%U 604462909807314587353087,9671406556917033397649407

%N (2^(2p - 1)/4)-1, where p is the n-th prime.

%F a(n)=(A139286(n)/4)-1.

%t (2^(2#-1))/4-1&/@Prime[Range[20]] (* _Harvey P. Dale_, May 08 2011 *)

%Y Cf. A139286, A139287, A139288, A139289, A139290, A139291, A139293, A139294, A139306.

%K nonn

%O 1,2

%A _Omar E. Pol_, Apr 13 2008

%E Edited by _Max Alekseyev_, May 03 2009

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Last modified April 23 03:26 EDT 2019. Contains 322380 sequences. (Running on oeis4.)