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A071814 Numbers k such that the number of 1's in the binary representation of k equals bigomega(k), the number of prime divisors of k (counted with multiplicity). 31
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
EXAMPLE
232 is a term because 232 = 11101000_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
Sequence in context: A109600 A370802 A370810 * A066586 A146974 A133160
KEYWORD
easy,nonn
AUTHOR
Jason Earls, Jun 07 2002
STATUS
approved

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Last modified May 26 09:40 EDT 2024. Contains 372824 sequences. (Running on oeis4.)