Least n-digit number k with only odd digits such that the k-th triangular number also has only odd digits.
A349247
Least n-digit number k with only odd digits such that the k-th triangular number also has only odd digits.
Terms
- a(0) =1a(1) =13a(2) =177a(3) =1777a(4) =15173a(5) =135173a(6) =3397973a(7) =13535137a(8) =135157537a(9) =1193111377a(10) =11979759377a(11) =119595919137
External references
- oeis: A349247