a(0)=0, a(1)=1; for n>1, a(n) = a(n-1)+a(n-2), except where a(n-1) is a prime greater than 2, in which case a(n) = a(n-1)-a(n-2).
A376930
a(0)=0, a(1)=1; for n>1, a(n) = a(n-1)+a(n-2), except where a(n-1) is a prime greater than 2, in which case a(n) = a(n-1)-a(n-2).
Terms
- a(0) =0a(1) =1a(2) =1a(3) =2a(4) =3a(5) =1a(6) =4a(7) =5a(8) =1a(9) =6a(10) =7a(11) =1a(12) =8a(13) =9a(14) =17a(15) =8a(16) =25a(17) =33a(18) =58a(19) =91a(20) =149a(21) =58a(22) =207a(23) =265a(24) =472a(25) =737a(26) =1209a(27) =1946a(28) =3155a(29) =5101
External references
- oeis: A376930