Primes without "7" as a digit that remain prime when any single digit is replaced with "7".

A224321

Primes without "7" as a digit that remain prime when any single digit is replaced with "7".

Terms

    a(0) =2a(1) =3a(2) =5a(3) =11a(4) =13a(5) =19a(6) =31a(7) =41a(8) =43a(9) =61a(10) =109a(11) =139a(12) =251a(13) =643a(14) =4933a(15) =9433a(16) =36493a(17) =191416111a(18) =1304119699

External references