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A036349 Sum of prime factors is even (counted with multiplicity). 2
2, 4, 8, 9, 15, 16, 18, 21, 25, 30, 32, 33, 35, 36, 39, 42, 49, 50, 51, 55, 57, 60, 64, 65, 66, 69, 70, 72, 77, 78, 81, 84, 85, 87, 91, 93, 95, 98, 100, 102, 110, 111, 114, 115, 119, 120, 121, 123, 128, 129, 130, 132, 133, 135, 138, 140, 141, 143, 144, 145, 154, 155 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

EXAMPLE

141 = 3 * 47 -> sum = 50 -> 50 is even.

MATHEMATICA

Select[Range[160], EvenQ[Total[Times@@@FactorInteger[#]]]&] (* From Harvey P. Dale, Sep 21 2011 *)

CROSSREFS

Cf. A046363, A036350.

Sequence in context: A048300 A178953 A182653 * A155562 A048715 A028982

Adjacent sequences:  A036346 A036347 A036348 * A036350 A036351 A036352

KEYWORD

nonn,base

AUTHOR

Patrick De Geest (pdg(AT)worldofnumbers.com), Dec 15 1998.

EXTENSIONS

First term (2) from Harvey P. Dale, Sep 21 2011

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Last modified February 15 08:20 EST 2012. Contains 205729 sequences.