a(n) is the smallest prime that becomes composite if any single digit of its base-(2n+1) expansion is changed to a different digit (but not to zero).
A371509
a(n) is the smallest prime that becomes composite if any single digit of its base-(2n+1) expansion is changed to a different digit (but not to zero).
Terms
- a(0) =2a(1) =67a(2) =223a(3) =2789a(4) =701a(5) =2423a(6) =243367a(7) =10513a(8) =10909a(9) =2114429a(10) =68543a(11) =181141a(12) =6139219a(13) =114493a(14) =356479a(15) =399946711a(16) =22549349a(17) =8371249a(18) =660040873a(19) =12088631a(20) =3352003
External references
- oeis: A371509