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Search: id:A136356
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| A136356 |
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Composite N with k consecutive prime factors preceded by a prime N-1 for even or N-2 for odd. |
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+0
3
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| 4, 6, 9, 15, 30, 105, 1155, 2310, 15015, 30030, 255255, 4849845, 111546435
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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This sequence is different from A070826 and/or A118750
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FORMULA
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Compute the product of k consecutive sequences of prime factors 2 or 3,5,7,11,etc. where k=1,2,3,4,5,etc. Where composite N is preceded by prime N-1 for even or by prime N-2 for odd add N to the sequence.
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EXAMPLE
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a(4)=15 because k=2 and prime factors are 3 and 5; 15 is odd and n-2=13, prime.
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CROSSREFS
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Cf. A136349-A136355 A136357-A136358 A070826 A118750.
Adjacent sequences: A136353 A136354 A136355 this_sequence A136357 A136358 A136359
Sequence in context: A118696 A065856 A136357 this_sequence A136358 A115665 A118694
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KEYWORD
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easy,more,nonn,uned
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AUTHOR
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Enoch Haga (Enokh(AT)comcast.net), Dec 25 2007
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