A351916 a(1) = a(2) = 1; for n >= 2, a(n+1) = (a(n)^7 + 1)/a(n-1).

1, 1, 2, 129, 297233651245505, 1588898389043626055434220300433167237829218942966252641093888571632886068535351219199489258571766594

Offset

1,3

Comments

a(7) has 680 digits.

Links

Table of n, a(n) for n=1..6.

Maple

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

Crossrefs

Cf. A076839, A003819, A003818, A003821.

Sequence in context: A361890 A294274 A099824 * A300292 A259109 A190578

Adjacent sequences: A351913 A351914 A351915 * A351917 A351918 A351919

Keyword

nonn

Author

Robert Dougherty-Bliss, Feb 25 2022

Status

approved