Numbers k such that 7*10^k + 1 is prime.

Terms

a(0) =1a(1) =2a(2) =3a(3) =4a(4) =5a(5) =8a(6) =9a(7) =45a(8) =136a(9) =142a(10) =158a(11) =243a(12) =923a(13) =1235a(14) =2196a(15) =4650a(16) =6119a(17) =7324a(18) =9543a(19) =13494a(20) =20310a(21) =20360a(22) =232920a(23) =830865a(24) =902708a(25) =1454508