Number of ways of pairing odd numbers in the range 1 to n with even numbers in the range n+1 to 2n such that each pair sums to a prime.
A071058
Number of ways of pairing odd numbers in the range 1 to n with even numbers in the range n+1 to 2n such that each pair sums to a prime.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =2a(6) =4a(7) =6a(8) =10a(9) =7a(10) =21a(11) =11a(12) =40a(13) =53a(14) =215a(15) =181a(16) =773a(17) =939a(18) =3260a(19) =4432a(20) =23431a(21) =15811a(22) =80724a(23) =67891a(24) =429108a(25) =434963a(26) =2748239a(27) =2718150a(28) =21654009a(29) =21580655
External references
- oeis: A071058