A135954 (Nonprime Fibonacci numbers with prime indices, A050937) which have exactly 3 prime factors.

24157817, 44945570212853, 1500520536206896083277, 50095301248058391139327916261, 11463113765491467695340528626429782121, 3001082145496345390753066714782948988

Offset

1,1

Comments

Conjecture: All numbers in this sequence are products of three sums of two squares.

Links

Table of n, a(n) for n=1..6.

Mathematica

k = {}; Do[If[ !PrimeQ[Fibonacci[Prime[n]]], c = Length[FactorInteger[Fibonacci[Prime[n]]]]; If[c == 3, AppendTo[k, Fibonacci[Prime[n]]]]], {n, 1, 50}]; k

Crossrefs

Cf. A000045, A001605, A050937, A075737, A090819, A134787, A134851, A134852, A135953, A135955, A135956, A135957.

Sequence in context: A104922 A058323 A251248 * A203260 A268290 A183791

Adjacent sequences: A135951 A135952 A135953 * A135955 A135956 A135957

Keyword

nonn

Author

Artur Jasinski, Dec 08 2007

Status

approved