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A337197
Position of the first occurrence of n in A337196, where A337196(x) is the 3-adic valuation of 1+A000265(sigma(x)).
1
1, 19, 67, 211, 643, 3667, 5827, 17491, 104971, 628123, 1795063, 2759719, 4251523, 12754579, 83086924
OFFSET
0,2
COMMENTS
a(16) = 393475036, but a(15) is larger than that, thus the sequence is nonmonotonic.
FORMULA
For all n >= 0, A337196(a(n)) = n, with no n occurring in A337196 before a(n).
MATHEMATICA
With[{s = Array[IntegerExponent[1 + #/2^IntegerExponent[#, 2], 3] &@ DivisorSigma[1, #] &, 10^6]}, Array[FirstPosition[s, #][[1]] &, Max[s] + 1, 0]] (* Michael De Vlieger, Feb 22 2021 *)
CROSSREFS
Cf. also A200849.
Sequence in context: A357676 A142404 A139927 * A357365 A228670 A044157
KEYWORD
nonn,more
AUTHOR
STATUS
approved