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A093687 Numbers k such that the total number of 1's in the binary expansion of all the divisors of k sets a new record. 4
1, 2, 3, 6, 12, 18, 24, 30, 60, 90, 120, 180, 252, 360, 420, 504, 540, 630, 756, 840, 1080, 1260, 1980, 2520, 3780, 5040, 6300, 7560, 12600, 13860, 15120, 21420, 25200, 27720, 32760, 41580, 42840, 49140, 55440, 65520, 81900, 83160, 98280, 128520, 138600 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Amiram Eldar, Table of n, a(n) for n = 1..120

MATHEMATICA

a[n_] := Plus @@ DigitCount[Divisors[n], 2, 1]; am = -1; c = 0; seq={}; Do[a1 = a[n]; If[a1 > am, am = a1; c++; AppendTo[seq, n]], {n, 1, 10^4}]; seq (* Amiram Eldar, Dec 17 2019 *)

CROSSREFS

Cf. A093653.

Sequence in context: A324177 A280681 A328899 * A000423 A007335 A309311

Adjacent sequences:  A093684 A093685 A093686 * A093688 A093689 A093690

KEYWORD

nonn,base

AUTHOR

Jason Earls, May 16 2004

STATUS

approved

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Last modified May 24 13:55 EDT 2022. Contains 354033 sequences. (Running on oeis4.)