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 A095300 Numbers n such that A094758(n) < n. 3
 2, 6, 10, 12, 14, 18, 22, 24, 26, 30, 34, 38, 42, 46, 50, 54, 58, 60, 62, 66, 70, 74, 78, 82, 84, 86, 90, 94, 96, 98, 102, 106, 110, 114, 118, 120, 122, 126, 130, 132, 134, 138, 142, 146, 150, 154, 156, 158, 162, 166, 168, 170, 174, 178, 182, 186, 190, 194, 198, 202 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Amiram Eldar, Table of n, a(n) for n = 1..10000 EXAMPLE A094758(2) = 1 < 2, hence 2 is in the sequence. MATHEMATICA aQ[n_] := Module[{k = 1, r = DivisorSigma[0, n]/n}, While[DivisorSigma[0, k]/k != r, k++]; k < n]; Select[Range[200], aQ] (* Amiram Eldar, Aug 19 2019 *) PROG (PARI) for(n=1, 205, s=numdiv(n); k=1; while(n*numdiv(k)!=k*s, k++); if(k

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Last modified May 21 05:37 EDT 2022. Contains 353889 sequences. (Running on oeis4.)