Smallest number k > 0 such that b - r is even or r = 0 for all b = 1..n, r == k mod b.

Terms

a(0) =1a(1) =2a(2) =4a(3) =4a(4) =6a(5) =6a(6) =10a(7) =10a(8) =10a(9) =10a(10) =36a(11) =36a(12) =66a(13) =66a(14) =196a(15) =196a(16) =196a(17) =196a(18) =568a(19) =568a(20) =568a(21) =568a(22) =1008a(23) =1008a(24) =1288a(25) =1288a(26) =1288a(27) =1288a(28) =8398a(29) =8398