a(n) is the concatenation, in ascending order, of the set of digits 1,2,4,8 whose sum equals the n-th prime using a minimal number of digits.
A166745
a(n) is the concatenation, in ascending order, of the set of digits 1,2,4,8 whose sum equals the n-th prime using a minimal number of digits.
Terms
- a(0) =2a(1) =12a(2) =14a(3) =124a(4) =128a(5) =148a(6) =188a(7) =1288a(8) =12488a(9) =14888a(10) =124888a(11) =148888a(12) =188888a(13) =1288888a(14) =12488888a(15) =14888888a(16) =128888888a(17) =148888888a(18) =1288888888a(19) =12488888888a(20) =1888888888a(21) =124888888888a(22) =128888888888a(23) =188888888888
External references
- oeis: A166745