A082407 define u(k) as u(1)=1 u(k)=binomial(2*u(k-1),u(k-1)) (mod k), sequence gives values of k such that u(k)=0.

2, 12, 17, 21, 26, 31, 36, 42, 48, 53, 60, 74, 79, 84, 95, 102, 107, 113, 118, 123, 131, 136, 143, 151, 156, 162, 167, 172, 177, 185, 190, 195, 201, 212, 217, 224, 231, 236, 241, 246, 251, 257, 267, 272, 278, 293, 302, 310, 315, 325, 333, 339, 344, 349, 354