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 A362128 Indices of records in A360179. 4

%I #8 Apr 14 2023 11:36:12

%S 1,3,5,7,9,12,15,21,25,29,52,69,87,100,138,176,233,252,265,338,371,

%T 384,400,447,459,492,515,594,606,677,779,794,850,896,1100,1144,1204,

%U 1225,1243,1584,1674,1700,2214,2239,2265,2338,2568,3014,3621,3652,4027,4058,4437,4464,4584,4625,5111,5201,5281

%N Indices of records in A360179.

%H Michael De Vlieger, <a href="/A362128/b362128.txt">Table of n, a(n) for n = 1..8238</a>

%t nn = 6000; c[_] := False; h[_] := 0; f[n_] := DivisorSigma[0, n];

%t a[1] = j = u = 1; r = 0;

%t {1}~Join~Rest@ Reap[Do[

%t If[c[j],

%t k = j + f[u]; h[j]++; h[u]--,

%t k = f[j]; c[j] = True; h[j]++ ];

%t u = Min[u, j]; Set[{a[n], j}, {k, k}]; While[h[u] == 0, u++];

%t If[k > r, r = k; Sow[n]], {n, 2, nn}] ][[-1, -1]]

%Y Cf. A000005, A360179, A362127.

%K nonn

%O 1,2

%A _Michael De Vlieger_, Apr 09 2023

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Last modified May 27 23:16 EDT 2024. Contains 372900 sequences. (Running on oeis4.)