a(n) is the smallest number m such that prime(m) = n*m - 1, or 0 if no such m exists.

Terms

a(0) =0a(1) =2a(2) =1a(3) =0a(4) =70a(5) =182a(6) =440a(7) =1053a(8) =0a(9) =6458a(10) =0a(11) =40087a(12) =0a(13) =251737a(14) =637320a(15) =1617173a(16) =4124466a(17) =10553445a(18) =27067100a(19) =69709705a(20) =179992910a(21) =465769811a(22) =0a(23) =3140421738a(24) =8179002128a(25) =21338685403a(26) =0a(27) =0a(28) =382465573528a(29) =0