a(1) = 1, then the smallest number such that the concatenation a(r), a(s) is prime for all s > r.
A088647
a(1) = 1, then the smallest number such that the concatenation a(r), a(s) is prime for all s > r.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =7a(4) =73a(5) =433a(6) =607a(7) =13381a(8) =37279a(9) =4800307
External references
- oeis: A088647