Schroeder pseudoprimes: Composites k that divide the k-th Schroeder number A001003(k-1).

Terms

a(0) =105a(1) =261a(2) =301a(3) =693a(4) =1605a(5) =1755a(6) =2151a(7) =2905a(8) =2907a(9) =3393a(10) =3875a(11) =4641a(12) =4833a(13) =5005a(14) =5655a(15) =6279a(16) =6913a(17) =7161a(18) =8883a(19) =9405a(20) =10899a(21) =11025a(22) =11289a(23) =15687a(24) =17199a(25) =19203a(26) =22275a(27) =27387a(28) =36855a(29) =37791