A129963 -id:A129963 - cp's OEIS frontend

3, 61, 1019, 1180591620717411303389, 1569275433846670190958947355801916604025588861116008628129

Offset: 1

Alex Ratushnyak, Apr 06 2013

Corresponding n are given in A057908.

The next term has 797 digits. - Harvey P. Dale, Mar 16 2015

Cf. A057908 (n such that 4^n - n is prime).

Select[Table[4^n-n,{n,200}],PrimeQ] (* Harvey P. Dale, Mar 16 2015 *)

11, 6569, 16677181699666603

Offset: 1

Vincenzo Librandi, Jun 06 2016

Terms given correspond to k in A057900.

a(4) has 731 digits.

[a: n in [0..100] | IsPrime(a) where a is 3^n+n];

Select[Table[3^n + n, {n, 1, 1000}], PrimeQ]

a(n) = A104743(A057900(n)). - Amiram Eldar, Jul 27 2025

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