Triangular numbers in which the k-th digit, numbering them from right to left, either divides k or is a nonzero multiple of k. Is 1 only when k has no other single-digit divisor (less than 10).
A069558
Triangular numbers in which the k-th digit, numbering them from right to left, either divides k or is a nonzero multiple of k. Is 1 only when k has no other single-digit divisor (less than 10).
Terms
- a(0) =1a(1) =3a(2) =6a(3) =21a(4) =28a(5) =45a(6) =66a(7) =325a(8) =666a(9) =946a(10) =2346a(11) =2628a(12) =2926a(13) =8385a(14) =8646a(15) =52326a(16) =54946
External references
- oeis: A069558