A109365 a(-1)=a(0)=1 and recursively a(n) = prime(n)*(a(n-1)+a(n-2)).

1, 4, 15, 95, 770, 9515, 133705, 2434740, 48800455, 1178409485, 35589088260, 1139792430095, 43489116179135, 1829785252978430, 80550797873775295, 3871887406957425075, 209479224856053619610, 12587715623517651636415

Offset

0,2

Links

Table of n, a(n) for n=0..17.

Maple

A109365 := proc(n) if n<= 0 then 1; else ithprime(n)*(procname(n-1)+procname(n-2)) ; end if; end proc: # R. J. Mathar, Sep 15 2011

Crossrefs

Cf. A109366.

Sequence in context: A040025 A366697 A208991 * A352415 A079128 A356524

Adjacent sequences: A109362 A109363 A109364 * A109366 A109367 A109368

Keyword

nonn

Author

Giorgio Balzarotti, Aug 23 2005

Status

approved