Least multiple of n such that every partial concatenation followed by a 7 is prime.

Terms

a(0) =1a(1) =2a(2) =3a(3) =4a(4) =5a(5) =12a(6) =42a(7) =48a(8) =9a(9) =90a(10) =22a(11) =96a(12) =299a(13) =154a(14) =60a(15) =288a(16) =918a(17) =1026a(18) =380a(19) =60a(20) =2184a(21) =616a(22) =23a(23) =120a(24) =175a(25) =2964a(26) =135a(27) =980a(28) =319a(29) =1230