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A362454
Indices of 1's in A361897.
3
1, 2, 3, 5, 6, 7, 12, 17, 18, 19, 21, 22, 23, 25, 26, 27, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 48, 65, 66, 67, 69, 70, 71, 76, 84, 88, 92, 97, 98, 99, 101, 102, 103, 108, 113, 114, 115, 117, 118, 119, 124, 128, 129, 130, 131, 133, 134, 135, 140, 144, 145, 146, 147, 149, 150, 151, 153, 154, 155, 157, 158
OFFSET
1,2
LINKS
Paolo Xausa, Table of n, a(n) for n = 1..20000 (terms 1..4750 from N. J. A. Sloane)
MATHEMATICA
A362454[upto_]:=Module[{d=DivisorSigma[0, Range[upto]]}, Join[{1}, Table[If[First[d=Abs[Differences[d]]]==1, n, Nothing], {n, 2, upto}]]]; A362454[200] (* Paolo Xausa, May 07 2023 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, May 05 2023
STATUS
approved