login

Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.

a(1) = a(2) = 1; for n >= 2, a(n+1) = (a(n)^7 + 1)/a(n-1).
0

%I #7 Feb 25 2022 21:20:27

%S 1,1,2,129,297233651245505,

%T 1588898389043626055434220300433167237829218942966252641093888571632886068535351219199489258571766594

%N a(1) = a(2) = 1; for n >= 2, a(n+1) = (a(n)^7 + 1)/a(n-1).

%C a(7) has 680 digits.

%p a:=proc(n) option remember: if n <= 2 then 1: else (a(n-1)^7+1)/a(n-2): fi: end:

%Y Cf. A076839, A003819, A003818, A003821.

%K nonn

%O 1,3

%A _Robert Dougherty-Bliss_, Feb 25 2022