|
%I #5 Jul 11 2015 11:19:53
%S 2,13,28559,665230244078823349,
%T 195833931687186822327230545227550596864953022841534058316595001440791433
%N a(1) = 2; a(n) is greatest prime < a(n-1)^4.
%C Exponent-4 analog of A059785 a(n+1)=prevprime(a(n)^2), with exponent 3 being A118910 a(1) = 2; a(n) is greatest prime < a(n-1)^3.
%F a(1) = 2; a(n) is greatest prime < a(n-1)^4.
%e a(1) = 2, by definition.
%e a(2) = 13 = 2^4 - 3.
%e a(3) = 28559 = 13^4 - 2.
%e a(4) = 665230244078823349 = 28559^4 - 12.
%e a(5) = 195833931687186822327230545227550596864953022841534058316595001440791433 = 665230244078823349^4 - 168.
%e a(6) is too large to include.
%Y Cf. A001358, A055496, A076656, A006992, A005384, A005385, A118908-A118913.
%K easy,nonn
%O 1,1
%A _Jonathan Vos Post_, May 05 2006
| 