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4, 6, 9, 10, 14, 15, 21, 25, 26, 49, 51, 57, 58, 62, 65, 69, 74, 77, 106, 111, 115, 118, 119, 121, 122, 123, 129, 133, 134, 155, 158, 159, 161, 166, 169, 177, 178, 386, 393, 394, 395, 398, 403, 407, 411, 413, 437, 445, 446, 447, 451, 453, 458, 489, 493, 497
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,1
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COMMENTS
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Double factorials 0!! and 1!! are not considered distinct. Note that double factorial (n!!) is different from (n!)!.
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LINKS
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Table of n, a(n) for n=1..56.
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EXAMPLE
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384 = 2*19 = 8!!+2!!.
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MATHEMATICA
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Union[Select[Total/@Subsets[Range[10]!!, 10], PrimeOmega[#]==2&]] (* Harvey P. Dale, Aug 24 2012 *)
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CROSSREFS
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Cf. A006882, A001358, A115651, A115652, A115653.
Sequence in context: A253106 A320969 A113433 * A036326 A078972 A115652
Adjacent sequences: A115651 A115652 A115653 * A115655 A115656 A115657
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KEYWORD
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nonn
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AUTHOR
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Giovanni Resta, Jan 28 2006
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STATUS
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approved
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