Number of solutions to n = Sum_{i=1..pi(n-1)} c(i)*p(i) with c(i) in {-1,0,1}, p(n) = n-th prime and pi = A000720.
A215222
Number of solutions to n = Sum_{i=1..pi(n-1)} c(i)*p(i) with c(i) in {-1,0,1}, p(n) = n-th prime and pi = A000720.
Terms
- a(0) =0a(1) =0a(2) =0a(3) =0a(4) =1a(5) =1a(6) =1a(7) =2a(8) =2a(9) =3a(10) =1a(11) =5a(12) =5a(13) =13a(14) =12a(15) =11a(16) =11a(17) =29a(18) =28a(19) =74a(20) =73a(21) =71a(22) =69a(23) =184a(24) =182a(25) =176a(26) =173a(27) =170a(28) =164a(29) =446
External references
- oeis: A215222