a(n) is the smallest number k such that the letter "N" appears n times when k is written in English.
A060227
a(n) is the smallest number k such that the letter "N" appears n times when k is written in English.
Terms
- a(0) =1a(1) =9a(2) =19a(3) =99a(4) =119a(5) =199a(6) =999a(7) =1199a(8) =1999a(9) =9999a(10) =19999a(11) =99999a(12) =119999a(13) =199999a(14) =999999a(15) =1199999a(16) =1999999a(17) =9999999a(18) =19999999a(19) =99999999a(20) =119999999a(21) =199999999a(22) =999999999a(23) =1199999999a(24) =1999999999a(25) =9999999999a(26) =19999999999a(27) =99999999999a(28) =119999999999a(29) =199999999999
External references
- oeis: A060227