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Search: id:A136358
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| A136358 |
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Composite N with k consecutive prime factors both preceded and followed by a prime N-1 and N+1 for even, N-2 and N+2 for odd. |
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+0
6
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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 both preceded and followed by a prime N-1 and N+1 for even, N-2 and N+2 for odd, add N to the sequence.
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EXAMPLE
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a(1)=4 is preceded by 3 and followed by 5, both primes; a(3)=9, preceded by 7 and followed by 11, both primes.
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CROSSREFS
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Cf. A136349-A136357 A070826 A118750.
Adjacent sequences: A136355 A136356 A136357 this_sequence A136359 A136360 A136361
Sequence in context: A065856 A136357 A136356 this_sequence A115665 A118694 A085648
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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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