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 A362133 Smallest indices k where A362131(k) = A362132(n). 1
 1, 3, 5, 7, 9, 12, 17, 31, 36, 41, 58, 74, 82, 112, 160, 189, 198, 220, 294, 325, 914, 1267, 1389, 1872, 1927, 1957, 2032, 2155, 2184, 2302, 2358, 2835, 3047, 3672, 3794, 3832, 3873, 3924, 4543, 4785, 35502, 98365, 1728198, 8375015 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Next term exceeds 2^28, if it exists. LINKS Table of n, a(n) for n=1..44. Michael De Vlieger, Plot (log_2 a(n), A362132(n)) at (x, y). MATHEMATICA nn = 2^20; c[_] := False; q[_] := False; h[_] := 0; f[n_] := DivisorSigma[0, n]; a[1] = j = u = w = 1; {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], q[k], j}, {k, True, k}]; While[h[u] == 0, u++]; If[k == w, While[q[w], w++]; Sow[n]], {n, 2, nn}] ][[-1, -1]] CROSSREFS Cf. A360179, A362131, A362132. Sequence in context: A265059 A349828 A096231 * A373706 A100432 A261033 Adjacent sequences: A362130 A362131 A362132 * A362134 A362135 A362136 KEYWORD nonn,more AUTHOR Michael De Vlieger, Apr 10 2023 STATUS approved

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Last modified June 23 07:33 EDT 2024. Contains 373629 sequences. (Running on oeis4.)