Smallest k such that k//A002275(n)//k is prime, where // denotes concatenation and A002275(n) is the n-th repunit (R_n).
A263182
Smallest k such that k//A002275(n)//k is prime, where // denotes concatenation and A002275(n) is the n-th repunit (R_n).
Terms
- a(0) =1a(1) =3a(2) =13a(3) =17a(4) =1073a(5) =19a(6) =17a(7) =29a(8) =10000117a(9) =73a(10) =17a(11) =3a(12) =1007a(13) =3a(14) =43a(15) =11a(17) =1a(18) =31a(19) =11a(20) =1191a(21) =1a(22) =1143a(23) =31a(24) =10000079a(25) =21a(26) =91a(27) =59a(28) =1019a(29) =3a(30) =67
External references
- oeis: A263182