Composite numbers n such that Sum_{k = 0..n} (-1)^k * C(n,k) * C(2*n,k) == -1 (mod n^3) (see A234839).
A268303
Composite numbers n such that Sum_{k = 0..n} (-1)^k * C(n,k) * C(2*n,k) == -1 (mod n^3) (see A234839).
Terms
- a(0) =10a(1) =25a(2) =146a(3) =586a(4) =2186a(5) =2386a(6) =2594a(7) =2642a(8) =4162a(9) =4226a(10) =4258a(11) =5186a(12) =7745a(13) =8258a(14) =8354a(15) =8458a(16) =8714a(17) =8746a(18) =8842a(19) =10306a(20) =10378a(21) =10786a(22) =10826a(23) =10834a(24) =10898a(25) =16418a(26) =16546a(27) =16706a(28) =17026a(29) =17674
External references
- oeis: A268303