a(n) is the number 2 written (prime(n)-1)/2 times followed by the digit 1; a(1)=2.
A137287
a(n) is the number 2 written (prime(n)-1)/2 times followed by the digit 1; a(1)=2.
Terms
- a(0) =2a(1) =21a(2) =221a(3) =2221a(4) =222221a(5) =2222221a(6) =222222221a(7) =2222222221a(8) =222222222221
External references
- oeis: A137287