Odd numbers k such that (10^k - 1)/3 - 2*10^floor(k/2) is a palindromic wing prime (a.k.a. near-repdigit palindromic prime) of the form 3...313...3.
A077775
Odd numbers k such that (10^k - 1)/3 - 2*10^floor(k/2) is a palindromic wing prime (a.k.a. near-repdigit palindromic prime) of the form 3...313...3.
Terms
- a(0) =3a(1) =7a(2) =15a(3) =123a(4) =181a(5) =185a(6) =539a(7) =597a(8) =643a(9) =743a(10) =1553a(11) =3135a(12) =4769a(13) =5133a(14) =6177a(15) =11733a(16) =16103a(17) =18997a(18) =25271a(19) =49025a(20) =65043a(21) =87965
External references
- oeis: A077775