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Search: id:A136357
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| A136357 |
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Composite N with k consecutive prime factors followed by a prime N+1 for even or N+2 for odd. |
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+0
3
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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 followed 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 wirh prime factors 3 and 5 and 15 is followed by 17, prime;
a(5)=30 because k=3 with prime factors 2,3,5 and 30 is followed by 31, prime.
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CROSSREFS
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Cf. A136349-A136356 A136358 A070826 A118750.
Adjacent sequences: A136354 A136355 A136356 this_sequence A136358 A136359 A136360
Sequence in context: A033476 A118696 A065856 this_sequence A136356 A136358 A115665
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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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