a(1) = 7 then the smallest number such that the forward as well as the reverse n-th partial concatenation is a prime for n>1. (Reverse concatenation is taken term-wise and not digit-wise).
A083994
a(1) = 7 then the smallest number such that the forward as well as the reverse n-th partial concatenation is a prime for n>1. (Reverse concatenation is taken term-wise and not digit-wise).
Terms
- a(0) =7a(1) =1a(2) =29a(3) =3a(4) =9a(5) =73a(6) =39a(7) =3a(8) =443a(9) =547a(10) =41a(11) =913a(12) =417a(13) =219a(14) =149a(15) =3289a(16) =237a(17) =4503a(18) =1559a(19) =4297a(20) =8747a(21) =3003a(22) =4213a(23) =7163a(24) =1147a(25) =851a(26) =957a(27) =5589a(28) =6819a(29) =3931
External references
- oeis: A083994