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A361513 Novel terms in A361511, in order of appearance. 3
1, 2, 3, 4, 5, 6, 7, 8, 11, 9, 10, 13, 15, 12, 17, 19, 21, 24, 16, 18, 14, 23, 29, 20, 27, 22, 26, 28, 35, 32, 25, 30, 34, 36, 33, 31, 44, 38, 42, 37, 45, 39, 51, 49, 60, 41, 50, 43, 40, 46, 48, 52, 54, 58, 62, 53, 56, 59, 64, 65, 57, 55, 61, 47, 68, 63, 74, 72, 67, 80, 78 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
By definition the terms are distinct. It is an obvious conjecture that every number eventually appears, but is there a proof?
LINKS
Michael De Vlieger, Table of n, a(n) for n = 1..17905 (All novel terms in a(n) for n = 1..2^24)
MATHEMATICA
nn = 615; c[_] = False; f[n_] := DivisorSigma[0, n]; a[1] = m = 1; Reap[Do[(If[c[#], a[n] = # + f[a[m]] ; m++, a[n] = f[#] ; Sow[#]]; c[#] = True) &[a[n - 1]], {n, 2, nn}] ][[-1, -1]] (* Michael De Vlieger, Apr 08 2023 *)
CROSSREFS
Sequence in context: A354441 A354435 A358277 * A255004 A257728 A329303
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Apr 08 2023
STATUS
approved

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Last modified May 22 13:18 EDT 2024. Contains 372755 sequences. (Running on oeis4.)