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 A121807 #15 Sep 13 2021 11:38:28 %S A121807 10,21,122,233,1244,2345,12346,22357,32468,43569,54680,154781,255782, %T A121807 356793,457904,568005,679016,790117,1790128,2790239,3791240,4792351, %U A121807 5802362,6813363,7913364,9013465,10113576,11214587,12315688,13425689 %N A121807 Partial sums of A004676. %H A121807 Seiichi Manyama, <a href="/A121807/b121807.txt">Table of n, a(n) for n = 1..10000</a> %t A121807 Accumulate[FromDigits@IntegerDigits[#,2]&/@Prime@Range@30] (* _Giorgos Kalogeropoulos_, Sep 13 2021 *) %o A121807 (PARI) a(n) = sum(k=1, n, fromdigits(binary(prime(k)), 10)); \\ _Michel Marcus_, Sep 13 2021 %Y A121807 Cf. A000040, A004676, A067894. %K A121807 base,easy,nonn,less %O A121807 1,1 %A A121807 _Jonathan Vos Post_, Sep 09 2006