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 A251715 #19 Dec 16 2014 16:32:15 %S A251715 1,1,2,3,3,4,2,1,5,7,2,5,5,2,3,3,1,1,7,4,6,3,1,3,3,2,7,8,2,1,2,5,4,4, %T A251715 9,5,3,1,5,5,4,13,9,13,10,3,1,5,2,7,9,7,17,11,11,2,1,5,3,4,4,7,9,11, %U A251715 15,13,2,1,2,2,7,7,9,6,6,13,17,14,3,1,3,5 %N A251715 Array: A251637(n,k) / prime(n). %C A251715 T(n,k) = A251637(n,k) / A000040(n); %C A251715 A251637(n,k) = T(n,k) * A000040(n); %C A251715 for n > 2: T(n,1) = A251619(n); %C A251715 conjecture: A098550 is a permutation of the positive integers iff all rows are permutations of the positive integers. %C A251715 For third column with row numbers > 4: see A251542. - _Reinhard Zumkeller_, Dec 16 2014 %H A251715 Reinhard Zumkeller, <a href="/A251715/b251715.txt">Rows n = 1..125 of triangle, flattened</a> %e A251715 . n p | A251637(n,k) / p, with p = prime(n), n = 1..25, k = 1..20 %e A251715 . -------+----------------------------------------------------------- %e A251715 . 1 2 | 1 2 4 7 3 6 8 5 10 11 13 14 16 9 12 17 18 15 19 21 22 %e A251715 . 2 3 | 1 3 5 2 4 7 9 13 11 15 17 6 8 12 10 21 14 19 23 16 25 %e A251715 . 3 5 | 3 1 5 7 2 4 9 17 11 13 6 19 8 10 23 15 12 35 21 14 16 %e A251715 . 4 7 | 2 5 1 3 4 13 7 9 6 8 11 17 19 23 25 15 10 12 47 29 21 %e A251715 . 5 11 | 2 1 3 5 4 9 7 6 8 15 13 11 17 10 12 21 19 14 16 25 18 %e A251715 . 6 13 | 3 1 2 5 7 4 9 6 8 15 11 10 12 17 13 19 21 14 16 23 25 %e A251715 . 7 17 | 3 1 5 2 4 7 9 6 11 8 10 15 13 12 14 21 17 16 19 23 25 %e A251715 . 8 19 | 2 1 5 3 7 4 9 6 8 11 13 10 15 12 14 21 17 19 23 16 25 %e A251715 . 9 23 | 3 1 5 2 7 4 6 9 8 11 13 15 10 12 19 17 14 21 16 25 18 %e A251715 . 10 29 | 3 1 2 5 7 4 6 9 8 11 13 10 15 12 17 14 21 19 16 25 23 %e A251715 . 11 31 | 2 1 3 5 4 7 9 6 11 13 8 15 10 12 17 19 14 21 16 23 18 %e A251715 . 12 37 | 2 1 3 5 4 7 6 9 8 11 15 10 17 13 12 23 19 21 14 16 18 %e A251715 . 13 41 | 3 1 2 5 4 7 6 9 11 8 10 13 15 12 17 14 21 19 16 25 23 %e A251715 . 14 43 | 2 1 3 5 4 7 9 6 11 8 10 15 13 12 14 19 17 21 16 23 18 %e A251715 . 15 47 | 2 1 7 3 5 4 6 9 11 8 10 13 15 12 17 19 14 21 16 23 25 %e A251715 . 16 53 | 2 1 5 3 4 7 6 9 8 11 13 10 15 12 17 14 21 19 16 18 25 %e A251715 . 17 59 | 2 1 3 5 4 7 6 9 11 8 13 10 15 17 12 14 19 21 16 23 18 %e A251715 . 18 61 | 2 1 7 3 5 4 6 9 11 8 13 10 15 12 17 14 19 21 16 23 18 %e A251715 . 19 67 | 3 1 5 2 4 7 9 6 8 11 13 10 15 12 17 14 19 21 16 23 18 %e A251715 . 20 71 | 2 1 3 5 4 7 6 9 8 11 10 15 13 12 17 14 19 21 16 23 18 %e A251715 . 21 73 | 2 1 5 3 4 7 6 9 8 11 10 13 15 12 17 14 19 21 16 23 18 %e A251715 . 22 79 | 2 1 3 5 4 7 6 9 8 11 13 10 15 12 14 17 19 21 16 23 18 %e A251715 . 23 83 | 3 1 7 2 5 4 6 9 11 8 13 10 15 12 17 19 14 21 16 23 18 %e A251715 . 24 89 | 2 1 3 5 4 7 6 9 8 11 13 10 15 12 17 14 21 19 16 23 18 %e A251715 . 25 97 | 3 1 7 2 5 4 6 9 11 8 10 13 15 12 17 14 19 21 16 23 18 . %e A251715 . -------------------------------------------------------------------- %e A251715 See table A251637 for T(n,k) * p. %Y A251715 Cf. A098550, A251637, A000040, A251619. %K A251715 nonn,tabl %O A251715 1,3 %A A251715 _Reinhard Zumkeller_, Dec 09 2014 %E A251715 Wrong data replaced; _Reinhard Zumkeller_, Dec 15 2014