a(1) = 0, a(2) = -2; for n > 2, a(n) + a(n-2) - a(n-3) - a(n-5) - ... - a(n-p) = (-1)^(n+1)*n if n is prime, otherwise = 0, where p = largest prime < n.
A002120
a(1) = 0, a(2) = -2; for n > 2, a(n) + a(n-2) - a(n-3) - a(n-5) - ... - a(n-p) = (-1)^(n+1)*n if n is prime, otherwise = 0, where p = largest prime < n.
Terms
- a(0) =0a(1) =-2a(2) =3a(3) =2a(4) =0a(5) =1a(6) =7a(7) =2a(8) =-6a(9) =8a(10) =22a(11) =-7a(12) =0a(13) =33a(14) =3a(15) =-14a(16) =51a(17) =46a(18) =-19a(19) =12a(20) =94a(21) =42a(22) =-23a(23) =113a(24) =150a(25) =-54a(26) =48a(27) =345a(28) =116a(29) =-109
External references
- oeis: A002120