a(1) = 11, a(n) = least k such that concatenation of n copies of k with all previous concatenation gives a prime.
A111477
a(1) = 11, a(n) = least k such that concatenation of n copies of k with all previous concatenation gives a prime.
Terms
- a(0) =11a(1) =19a(2) =19a(3) =37a(4) =21a(5) =71a(6) =101a(7) =39a(8) =61a(9) =87a(10) =227a(11) =63a(12) =437a(13) =153a(14) =1363a(15) =117a(16) =363a(17) =861a(18) =609a(19) =249a(20) =23a(21) =1077a(22) =3123a(23) =771a(24) =3717a(25) =633a(26) =279a(27) =1119a(28) =927a(29) =107
External references
- oeis: A111477