Prime numbers P such that 10^(n+d+1) + P*10^n + 1 is prime for n=1 to 5 with d = number of digits of P.
A180949
Prime numbers P such that 10^(n+d+1) + P*10^n + 1 is prime for n=1 to 5 with d = number of digits of P.
Terms
- a(0) =223283a(1) =248903a(2) =924773a(3) =1469627a(4) =2121767a(5) =2428241a(6) =2429411a(7) =2614043a(8) =2885453a(9) =3444893a(10) =3512849a(11) =3564461a(12) =4316141a(13) =4438067a(14) =4605977a(15) =4980161a(16) =5267519a(17) =6248057a(18) =6961673a(19) =7519607a(20) =8517563a(21) =9716789a(22) =9846443a(23) =12383099a(24) =13127507
External references
- oeis: A180949