Number of solutions to c(1)*prime(1) + ... + c(n)*prime(n) = 2, where c(i) = +-1 for i > 1, c(1) = 1.
A022896
Number of solutions to c(1)*prime(1) + ... + c(n)*prime(n) = 2, where c(i) = +-1 for i > 1, c(1) = 1.
Terms
- a(0) =1a(1) =0a(2) =0a(3) =0a(4) =0a(5) =0a(6) =2a(7) =0a(8) =4a(9) =0a(10) =14a(11) =0a(12) =38a(13) =0a(14) =126a(15) =0a(16) =394a(17) =0a(18) =1290a(19) =0a(20) =4344a(21) =0a(22) =14846a(23) =0a(24) =51068a(25) =0a(26) =178436a(27) =0a(28) =634568a(29) =0
External references
- oeis: A022896