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A071814 Number of 1's in binary representation of n equals bigomega(n), the number of prime divisors of n (counted with multiplicity). 3
2, 6, 9, 10, 28, 33, 34, 42, 44, 50, 52, 54, 60, 65, 70, 76, 90, 98, 129, 135, 138, 148, 150, 156, 164, 184, 198, 204, 210, 225, 228, 232, 261, 266, 268, 273, 290, 292, 294, 297, 306, 308, 322, 330, 340, 344, 385, 388, 390, 405, 424, 440, 468, 486, 496, 504 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

A115156 is a subsequence: A001222(A115156(n))=A000120(A115156(n))=n. - Reinhard Zumkeller, Jan 14 2006

LINKS

Ivan Neretin, Table of n, a(n) for n = 1..10000

EXAMPLE

232 is a term because 232 = 11101000 in base 2 and 232=2^3*29.

MATHEMATICA

fQ[n_] := Count[IntegerDigits[n, 2], 1] == Plus @@ Last /@ FactorInteger@n; Select[ Range@517, fQ[ # ] &] (* Robert G. Wilson v, Jan 18 2006 *)

Select[Range[600], Count[IntegerDigits[#, 2], 1]==PrimeOmega[#]&] (* Harvey P. Dale, Mar 07 2019 *)

CROSSREFS

Cf. A001222, A071594.

Sequence in context: A085304 A015843 A109600 * A066586 A146974 A133160

Adjacent sequences:  A071811 A071812 A071813 * A071815 A071816 A071817

KEYWORD

easy,nonn

AUTHOR

Jason Earls, Jun 07 2002

STATUS

approved

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Last modified March 23 14:17 EDT 2019. Contains 321431 sequences. (Running on oeis4.)