a(1) = 9, 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).
A083995
a(1) = 9, 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) =9a(1) =7a(2) =1a(3) =27a(4) =3a(5) =63a(6) =191a(7) =297a(8) =207a(9) =19a(10) =3107a(11) =147a(12) =159a(13) =5679a(14) =4579a(15) =2739a(16) =2223a(17) =8517a(18) =8649a(19) =2531a(20) =1699a(21) =3969a(22) =797a(23) =12883a(24) =11013a(25) =4811a(26) =15657a(27) =2719a(28) =2231a(29) =15391
External references
- oeis: A083995