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A083872
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Triangle read by rows in which row n lists first appearance of m such that m divides n!.
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2
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1, 2, 3, 6, 4, 8, 12, 24, 5, 10, 15, 20, 30, 40, 60, 120, 9, 16, 18, 36, 45, 48, 72, 80, 90, 144, 180, 240, 360, 720, 7, 14, 21, 28, 35, 42, 56, 63, 70, 84, 105, 112, 126, 140, 168, 210, 252, 280, 315, 336, 420, 504, 560, 630, 840, 1008, 1260, 1680, 2520, 5040, 32, 64
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| Differs from A110797 starting at a(17)=9.
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EXAMPLE
| 1!:1
2!:1,2 -> 2 as 1 has already appeared
3!:1,2,3,6 -> 3,6
4!:1,2,3,4,6,8,12,24 -> 4,8,12,24
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MATHEMATICA
| lst = {1}; Do[lst = Join[lst, Complement[Divisors[n!], Divisors[(n - 1)!]]], {n, 2, 9}]; lst (* From Vladimir Joseph Stephan Orlovsky, Jul 07 2011 *)
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CROSSREFS
| Cf. A002034.
Sequence in context: A127562 A096113 A110797 * A121663 A096112 A052330
Adjacent sequences: A083869 A083870 A083871 * A083873 A083874 A083875
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KEYWORD
| nonn,tabf
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AUTHOR
| Jon Perry (perry(AT)globalnet.co.uk), Jun 18 2003
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EXTENSIONS
| Extended by Ray Chandler (rayjchandler(AT)sbcglobal.net), Aug 23 2005
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