%I #19 Sep 08 2022 08:46:01

%S 1,27,8387,1596559,67137477,1221074483,13065520903,96951759015,

%T 550571544713,2552470327819,10137858491979,36314872538111,

%U 130291290501709,605750213184675,4731091158953615,53132088082450327,669920208810550545

%N a(n) = n^13 + 13*n + 13^n.

%C This is to A220425 as 13 is to 2, to A220509 as 13 is to 3, to A220511 as 13 is to 5, to A220528 as 13 is to 7, and to A220653 as 13 is to 11. The subsequence of primes begins: 8387, 13065520903.

%H G. C. Greubel, <a href="/A209261/b209261.txt">Table of n, a(n) for n = 0..895</a>

%e a(2) = 2^13 + 13*2 + 13^2 = 8387.

%t Table[n^13 + 13*n + 13^n, {n,0,30}] (* _G. C. Greubel_, Jan 05 2018 *)

%o (Maxima) makelist(n^13 + 13*n + 13^n,n,0,20); /* _Martin Ettl_, Jan 15 2013 */

%o (PARI) for(n=0,30, print1(n^13 + 13*n + 13^n, ", ")) \\ _G. C. Greubel_, Jan 05 2018

%o (Magma) [n^13 + 13*n + 13^n: n in [0..30]]; // _G. C. Greubel_, Jan 05 2018

%Y Cf. A008455, A008593, A001020, A220425, A220509, A220511, A220528, A220653, A220787.

%K nonn,easy

%O 0,2

%A _Jonathan Vos Post_, Jan 14 2013