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A097421 (5^(2^n) - 1)/2^(n+2). 3

%I #3 Mar 31 2012 10:26:03

%S 1,3,39,12207,2384185791,181898940354585647583,

%T 2117582368135750847670806251699104905128479,

%U 573971850987445072250359637315549647372395291392620860111695169081258427468128502368927

%N (5^(2^n) - 1)/2^(n+2).

%Y Cf. A070632.

%K nonn

%O 0,2

%A _Lekraj Beedassy_, Aug 21 2004

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Last modified February 26 15:44 EST 2024. Contains 370352 sequences. (Running on oeis4.)