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 A104129 #15 Mar 23 2025 16:02:33 %S A104129 4,12,630,117656,25937424612,23298085122494,48661191875666868498, %T A104129 104127350297911241532860,907846434775996175406740561352, %U A104129 88540901833145211536614766025207452637390 %N A104129 Integers of the form p^(p-1)+p where p is prime. %C A104129 Sum of the reciprocals 1/a(n) rapidly converges to 0.3349291343132812638... - _R. J. Mathar_, Apr 27 2007 %F A104129 From _R. J. Mathar_, Apr 27 2007: (Start) %F A104129 a(n) = A036878(n)+p where p=A000040(n). %F A104129 For p>2, a(n) = p*[1+A085531(A005097(n-1))]. (End) %t A104129 #^(#-1)+#&/@Prime[Range[10]] (* _Harvey P. Dale_, Mar 23 2025 *) %Y A104129 Cf. A000040, A005097, A036878, A085531. %K A104129 easy,nonn %O A104129 1,1 %A A104129 _Cino Hilliard_, Mar 06 2005 %E A104129 Edited by _R. J. Mathar_, Apr 27 2007