Numbers k such that 10^k + 3*R_k + 6 is prime, where R_k = 11...1 is the repunit (A002275) of length k.
A102933
Numbers k such that 10^k + 3*R_k + 6 is prime, where R_k = 11...1 is the repunit (A002275) of length k.
Terms
- a(0) =1a(1) =2a(2) =4a(3) =7a(4) =10a(5) =13a(6) =14a(7) =22a(8) =23a(9) =29a(10) =38a(11) =50a(12) =53a(13) =67a(14) =104a(15) =350a(16) =376a(17) =412a(18) =1205a(19) =1835a(20) =2510a(21) =2668a(22) =6097a(23) =8296a(24) =14296a(25) =43369a(26) =127349a(27) =142034
External references
- oeis: A102933