This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A345895 #15 Oct 08 2021 12:15:20
%S A345895 1,10,84,16452,15630,2176783854,5764808,35184374186504,2541865834899,
%T A345895 1000000000001001010,3138428376732,1648446623609512552867179993036,
%U A345895 3937376385699302,3214199700417740938226879430,16834112196028232574474331890,21267647932558653967613834469360799760
%N A345895 a(n) = Sum_{d|n} n^sigma(d).
%H A345895 Seiichi Manyama, <a href="/A345895/b345895.txt">Table of n, a(n) for n = 1..167</a>
%F A345895 a(prime(n)) = A104128(n). - _Michel Marcus_, Jun 29 2021
%e A345895 a(4) = Sum_{d|4} 4^sigma(d) = 4^1 + 4^3 + 4^7 = 16452.
%t A345895 a[n_] := DivisorSum[n, n^DivisorSigma[1, #] &]; Array[a, 16] (* _Amiram Eldar_, Jun 29 2021 *)
%o A345895 (PARI) a(n) = sumdiv(n, d, n^sigma(d)); \\ _Michel Marcus_, Jun 29 2021
%Y A345895 Cf. A000203 (sigma), A104128, A174472, A345271.
%K A345895 nonn
%O A345895 1,2
%A A345895 _Wesley Ivan Hurt_, Jun 28 2021