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 A355091 #10 Jun 26 2022 09:15:10 %S A355091 2,3,5,2,7,11,3,2,5,13,17,19,23,7,3,2,5,11,29,31,13,7,3,2,2,3,5,11,17, %T A355091 37,41,19,43,47,53,59,23,13,29,61,67,31,17,7,5,3,2,5,7,11,19,37,71,73, %U A355091 41,23,13,11,7,3,2,2,3,5,11,13,17,29,43,79 %N A355091 Variant of A253028 using only prime numbers. %C A355091 See the examples in A253028 for a detailed illustration of how the array is constructed: %C A355091 - the n-th term gives the length of the n-th row. %C A355091 - if you remove the eventual leading and trailing term in each row, you get the prime numbers, in natural order, %C A355091 - repeating this procedure with the remaining terms always yields the prime numbers, in natural order. %H A355091 Rémy Sigrist, <a href="/A355091/b355091.txt">Table of n, a(n) for n = 1..10022</a> %H A355091 Rémy Sigrist, <a href="/A355091/a355091.gp.txt">PARI program</a> %e A355091 The first terms / rows are: %e A355091 n a(n) n-th row %e A355091 -- ---- ------------------------------------------------------------ %e A355091 1 2 2, 3 %e A355091 2 3 5, 2, 7 %e A355091 3 5 11, 3, 2, 5, 13 %e A355091 4 2 17, 19 %e A355091 5 7 23, 7, 3, 2, 5, 11, 29 %e A355091 6 11 31, 13, 7, 3, 2, 2, 3, 5, 11, 17, 37 %e A355091 7 3 41, 19, 43 %e A355091 8 2 47, 53 %e A355091 9 5 59, 23, 13, 29, 61 %e A355091 10 13 67, 31, 17, 7, 5, 3, 2, 5, 7, 11, 19, 37, 71 %e A355091 11 17 73, 41, 23, 13, 11, 7, 3, 2, 2, 3, 5, 11, 13, 17, 29, 43, 79 %o A355091 (PARI) See Links section. %Y A355091 Cf. A253028, A354576, A354577. %K A355091 nonn,tabf %O A355091 1,1 %A A355091 _Rémy Sigrist_, Jun 19 2022