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 A072057 #15 Apr 26 2024 03:15:15
%S A072057 6,8,12,24,24,40,48,56,48,60,104,124,84,120,120,108,144,168,240,168,
%T A072057 228,216,168,180,336,240,312,264,296,228,432,264,372,416,336,408,624,
%U A072057 440,408,348,360,532,384,572,480,640,624,600,672,720,468
%N A072057 Sum of divisors of 2*prime(n)+1.
%H A072057 Reinhard Zumkeller, <a href="/A072057/b072057.txt">Table of n, a(n) for n = 1..10000</a>
%F A072057 a(n) = A000203(A072055(n)).
%e A072057 Divisors of A072055(8) = 2*A000040(8)+1 = 2*19+1 = 39: {1,3,13,39}, therefore a(8) = 1+3+13+39 = 56.
%t A072057 DivisorSigma[1,#]&/@(2Prime[Range[60]]+1) (* _Harvey P. Dale_, Sep 17 2013 *)
%o A072057 (Haskell)
%o A072057 a072057 = a000203 . a072055 -- _Reinhard Zumkeller_, Oct 10 2013
%o A072057 (PARI) a(n) = sigma(2*prime(n)+1); \\ _Amiram Eldar_, Apr 26 2024
%o A072057 (PARI) lista(pmax) = forprime(p = 2, pmax, print1(sigma(2*p+1), ", ")); \\ _Amiram Eldar_, Apr 26 2024
%Y A072057 Cf. A000040, A000203, A072055, A072056.
%K A072057 nonn
%O A072057 1,1
%A A072057 _Reinhard Zumkeller_, Jun 11 2002