Number of solutions to c(1)*prime(4) + c(2)*prime(5) + ... + c(2n-1)*prime(2n+2) = -1, where c(i) = +-1 for i>1, c(1) = 1.
A261045
Number of solutions to c(1)*prime(4) + c(2)*prime(5) + ... + c(2n-1)*prime(2n+2) = -1, where c(i) = +-1 for i>1, c(1) = 1.
Terms
- a(0) =0a(1) =0a(2) =0a(3) =1a(4) =2a(5) =5a(6) =32a(7) =93a(8) =261a(9) =1082a(10) =3253a(11) =12307a(12) =40809a(13) =153392a(14) =525417a(15) =1892876a(16) =6847161a(17) =25256461a(18) =91268129a(19) =335852960a(20) =1239350769a(21) =4606651034a(22) =17073491494a(23) =63523866957a(24) =237953442636a(25) =892247156886
External references
- oeis: A261045