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A361514 Lengths of rows when A361511 is regarded as an irregular triangle. 3
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 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Essentially the first differences of A361512.
LINKS
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 *)
CROSSREFS
Sequence in context: A305979 A366805 A293223 * A029348 A070093 A174931
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Apr 08 2023
STATUS
approved

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Last modified April 22 05:00 EDT 2024. Contains 371887 sequences. (Running on oeis4.)