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A337197
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Position of the first occurrence of n in A337196, where A337196(x) is the 3-adic valuation of 1+A000265(sigma(x)).
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1
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1, 19, 67, 211, 643, 3667, 5827, 17491, 104971, 628123, 1795063, 2759719, 4251523, 12754579, 83086924
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OFFSET
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0,2
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COMMENTS
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a(16) = 393475036, but a(15) is larger than that, thus the sequence is nonmonotonic.
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LINKS
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FORMULA
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For all n >= 0, A337196(a(n)) = n, with no n occurring in A337196 before a(n).
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MATHEMATICA
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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 *)
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CROSSREFS
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KEYWORD
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nonn,more
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AUTHOR
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STATUS
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approved
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