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A074069 Numbers n such that S(n) = 3n (see A068119). 1
1, 2, 10, 18, 20, 25, 26, 43, 46, 55, 56, 71, 79, 104, 107, 111, 112, 113, 123, 133, 136, 140, 142, 144, 145, 147, 150, 155, 165, 195, 196, 200, 204, 206, 210, 214, 216, 253, 254, 259, 260, 264, 267, 327, 335, 343, 360, 363, 375, 376, 380, 387, 388, 393 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..54.

MATHEMATICA

ce[n_] := Length[NestWhileList[#*Ceiling[#] &, n + 1/4, ! IntegerQ[#] &]] - 1; nn = Range[395]; t = Accumulate[ce /@ nn]; Select[nn, t[[#]] == 3*# &] (* Jayanta Basu, Jul 29 2013 *)

CROSSREFS

Sequence in context: A258974 A077247 A082939 * A069081 A126005 A017089

Adjacent sequences:  A074066 A074067 A074068 * A074070 A074071 A074072

KEYWORD

nonn

AUTHOR

Benoit Cloitre, Aug 30 2002

STATUS

approved

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Last modified March 18 20:24 EDT 2019. Contains 321294 sequences. (Running on oeis4.)