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 A153474 #8 Feb 28 2023 10:07:59 %S A153474 3,10,41,168,8359,139430,663717,2148147364,2305843011361841315, %T A153474 618970021948533148811403426,162259895799235311924726821691553, %U A153474 170141345720365030966999228442705797280 %N A153474 Sum of first n Mersenne primes A000668. %H A153474 Harvey P. Dale, <a href="/A153474/b153474.txt">Table of n, a(n) for n = 1..18</a> %t A153474 Accumulate[2^MersennePrimeExponent[Range[15]]-1] (* _Harvey P. Dale_, Feb 28 2023 *) %Y A153474 Cf. A007504, A092336, A000668, A153475. %K A153474 nonn %O A153474 1,1 %A A153474 _Omar E. Pol_, Dec 27 2008 %E A153474 More terms from _Max Alekseyev_, Apr 13 2009