A272374 - OEIS

A272374

Numbers n such that A187202(n) is <= 0.

10, 14, 20, 22, 24, 26, 28, 34, 36, 38, 40, 46, 48, 50, 58, 60, 62, 63, 70, 74, 80, 82, 84, 86, 94, 96, 98, 99, 100, 105, 106, 117, 118, 120, 122, 134, 136, 138, 140, 142, 146, 152, 153, 154, 158, 160, 166, 170, 171, 174, 178, 180, 182, 184, 186, 189, 190, 192, 194, 196, 198, 200, 202, 206, 208, 214

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

Odd terms: 63, 99, 105, 117, 153, 171, 189, ..., .

Indices n where A187202(n) =0 are 10, 171, 1947, 2619, 265105, ...- R. J. Mathar, May 06 2016

LINKS

R. J. Mathar, Table of n, a(n) for n = 1..5000

MATHEMATICA

f[n_] := Block[{d = Divisors@ n}, Differences[d, Length@ d - 1][[1]]]; Select[ Range@ 215, f@# < 1&]

CROSSREFS

Cf. A187202, A187204, A272375.