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A178427 7 followed by the Fermat numbers A152581. 3

%I

%S 7,9,65,4097,16777217,281474976710657,79228162514264337593543950337,

%T 6277101735386680763835789423207666416102355444464034512897,

%U 394020061963944792122790401001436138050797392704654466679482934042457217714972

%N 7 followed by the Fermat numbers A152581.

%C If a(0)=3, the recursion formula gives A000215.

%F a(0)=7. a(n)= 2+product_{i=0..n-1} a(i).

%t Clear[a, n];

%t a[0] := 7;

%t a[n_] := a[n] = Product[a[i], {i, 0, n - 1}] + 2;

%t Table[a[n], {n, 0, 10}]

%Y Cf. A000215, A178426, A178428.

%K nonn

%O 0,1

%A _Roger L. Bagula_, May 27 2010

%E Definition simplified by the Assoc. Eds. of the OEIS - May 28 2010

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Last modified August 13 19:30 EDT 2020. Contains 336451 sequences. (Running on oeis4.)