A090228 Products of consecutive members of A090206 (nonprime Fibonacci numbers).

0, 1, 8, 168, 714, 1870, 7920, 54288, 229970, 602070, 2550408, 10803704, 28284465, 74049690, 193864606, 821223648, 3478759200, 9107509825, 23843770274, 62423800998, 264431464440, 1120149658760, 2932589879121, 7677619978602

Offset

0,3

Links

Table of n, a(n) for n=0..23.

Formula

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, Oct 13 2005

Crossrefs

Cf. A090206, A000045

Sequence in context: A032395 A316756 A294512 * A220808 A221022 A039699

Adjacent sequences: A090225 A090226 A090227 * A090229 A090230 A090231

Keyword

easy,nonn

Author

Felix Tubiana, Jan 22 2004

Extensions

More terms from David Wasserman, Oct 13 2005

Status

approved