a(0)=0, a(1)=1; a(n)=a(n-1)+a(n-2) if a(n-1)+a(n-2) is not semiprime; otherwise a(n) is the largest prime divisor of a(n-1)+a(n-2).

A214094

a(0)=0, a(1)=1; a(n)=a(n-1)+a(n-2) if a(n-1)+a(n-2) is not semiprime; otherwise a(n) is the largest prime divisor of a(n-1)+a(n-2).

Terms

    a(0) =0a(1) =1a(2) =1a(3) =2a(4) =3a(5) =5a(6) =8a(7) =13a(8) =7a(9) =20a(10) =27a(11) =47a(12) =37a(13) =84a(14) =11a(15) =19a(16) =30a(17) =7a(18) =37a(19) =44a(20) =81a(21) =125a(22) =103a(23) =228a(24) =331a(25) =43a(26) =374a(27) =139a(28) =513a(29) =652

External references