A361514 Lengths of rows when A361511 is regarded as an irregular triangle.

1, 2, 2, 2, 2, 3, 2, 4, 3, 4, 3, 4, 7, 3, 5, 6, 6, 8, 4, 6, 3, 8, 6, 6, 6, 9, 5, 8, 6, 8, 5, 7, 7, 9, 8, 9, 9, 9, 12, 9, 10, 10, 10, 10, 14, 7, 15, 11, 14, 7, 14, 11, 15, 9, 11, 12, 10, 15, 10, 14, 16, 10, 14, 11, 13, 13, 15, 13, 14, 15, 19, 14, 13, 17, 18, 12, 13, 14, 13, 16

Offset: 1

Author

N. J. A. Sloane, Apr 08 2023

Keywords

• nonn

Comments

Essentially the first differences of A361512.

Links

• Michael De Vlieger, Table of n, a(n) for n = 1..17905

Crossrefs

Cf. A361511-A361513.

Programs

Mathematica

nn = 750; c[] = False; f[n] := DivisorSigma[0, n]; a[1] = k = m = 1; MapAt[# + 1 &, #, 1] &@ Reap[Do[(If[c[#], a[n] = # + f[a[m]] ; m++, a[n] = f[#] ; Sow[n - k - 1]; Set[k, n - 1]]; c[#] = True) &[a[n - 1]], {n, 2, nn}] ][[-1, -1]] (* Michael De Vlieger, Apr 08 2023 *)