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Search: id:A090228
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| A090228 |
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Products of consecutive members of A090206 (nonprime Fibonacci numbers). |
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+0
1
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| 0, 1, 8, 168, 714, 1870, 7920, 54288, 229970, 602070, 2550408, 10803704, 28284465, 74049690, 193864606, 821223648, 3478759200, 9107509825, 23843770274, 62423800998, 264431464440, 1120149658760, 2932589879121, 7677619978602
(list; graph; listen)
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OFFSET
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0,3
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FORMULA
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F(0) = 0; F(1) = 1; F(n) = F(n-1) + F(n-2); F(0:9) = 0, 1, 1, 2, 3, 5, 8, 13, 21, 34 nonprimes: 0, 1, 1, 8, 21 product of consecutive nonprimes: 1, 8, 168
a(n) = A090206(n)*A090206(n+1). - David Wasserman (wasserma(AT)spawar.navy.mil), Oct 13 2005
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CROSSREFS
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Cf. A090206, A000045
Sequence in context: A025606 A033454 A032395 this_sequence A039699 A084941 A139564
Adjacent sequences: A090225 A090226 A090227 this_sequence A090229 A090230 A090231
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KEYWORD
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easy,nonn
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AUTHOR
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Felix Tubiana (fat2(AT)columbia.edu), Jan 22 2004
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EXTENSIONS
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More terms from David Wasserman (wasserma(AT)spawar.navy.mil), Oct 13 2005
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