OFFSET
1,3
LINKS
Michel Marcus, Rows n = 1..100 of triangle, flattened
Michel Marcus, 100 rows
EXAMPLE
Triangle starts:
1;
1, 2;
1, 3, 2;
1, 3, 2, 4;
1, 5, 3, 2, 4;
1, 5, 3, 2, 4, 6;
1, 7, 5, 3, 2, 4, 6;
...
MATHEMATICA
f[n_] := Block[{t = Table[0, {n}], j, k}, For[j = 1, j <= n, j++, t[[j]] = {}; For[k = 1, k <= j, k++, AppendTo[t[[j]], DivisorSigma[1, k]/k]]]; Ordering /@ t]; f@ 13 // Flatten (* Michael De Vlieger, Mar 29 2015 *)
PROG
(PARI) lista(nn) = {for (n=1, nn, v = vector(n, k, sigma(k)/k); w = vecsort(v, , 1); for (k=1, n, print1(w[k], ", ")); print(); ); }
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Michel Marcus, Mar 29 2015
STATUS
approved