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A362128 Indices of records in A360179. 4
1, 3, 5, 7, 9, 12, 15, 21, 25, 29, 52, 69, 87, 100, 138, 176, 233, 252, 265, 338, 371, 384, 400, 447, 459, 492, 515, 594, 606, 677, 779, 794, 850, 896, 1100, 1144, 1204, 1225, 1243, 1584, 1674, 1700, 2214, 2239, 2265, 2338, 2568, 3014, 3621, 3652, 4027, 4058, 4437, 4464, 4584, 4625, 5111, 5201, 5281 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
MATHEMATICA
nn = 6000; c[_] := False; h[_] := 0; f[n_] := DivisorSigma[0, n];
a[1] = j = u = 1; r = 0;
{1}~Join~Rest@ Reap[Do[
If[c[j],
k = j + f[u]; h[j]++; h[u]--,
k = f[j]; c[j] = True; h[j]++ ];
u = Min[u, j]; Set[{a[n], j}, {k, k}]; While[h[u] == 0, u++];
If[k > r, r = k; Sow[n]], {n, 2, nn}] ][[-1, -1]]
CROSSREFS
Sequence in context: A226331 A333601 A316312 * A118015 A265057 A122643
KEYWORD
nonn
AUTHOR
Michael De Vlieger, Apr 09 2023
STATUS
approved

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Last modified April 14 00:20 EDT 2024. Contains 371652 sequences. (Running on oeis4.)