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A111300
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Positive integers that are the difference between two double factorials.
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2
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0, 1, 2, 5, 6, 7, 12, 13, 14, 33, 40, 45, 46, 47, 57, 90, 97, 102, 103, 104, 279, 336, 369, 376, 381, 382, 383, 561, 840, 897, 930, 937, 942, 943, 944, 2895, 3456, 3735, 3792, 3825, 3832, 3837, 3838, 3839, 6555, 9450, 10011, 10290, 10347, 10380, 10387, 10392
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,3
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LINKS
| T. D. Noe, Table of n, a(n) for n = 1..1000
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FORMULA
| M!! - N!! where M and N positive integers
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EXAMPLE
| 7!! - 4!! = 7*5*3*1 - 4*2 = 105 - 8 = 97
9!! - 5!! = 9*7*5*3*1 - 5*3*1 = 945 - 15 = 930
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MATHEMATICA
| terms[n_]:=Sort[Union[Flatten[Table[j!!-i!!, {i, 1, n}, {j, i, n}]]]]; terms[12] (* Enrique Perez Herrero, May 21 2011 *)
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CROSSREFS
| Sequence in context: A058605 A103025 A134080 * A117548 A175135 A014489
Adjacent sequences: A111297 A111298 A111299 * A111301 A111302 A111303
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KEYWORD
| easy,nonn
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AUTHOR
| Paolo P. Lava & Giorgio Balzarotti (paoloplava(AT)gmail.com), Nov 02 2005
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EXTENSIONS
| Extended by T. D. Noe (noe(AT)sspectra.com), May 22 2011
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