68719

Appears in sequences

• Numbers that, when expressed in base 8 and then interpreted in base 10, yield a multiple of the original number.at n=11A032551
• Duplicate of A032551.at n=11A062945
• a(n) = (8*n+13*n^3+3*n^5)/24; also the sum of triangular numbers taken in successive groups of increasing size (see Example).at n=13A260513
• a(n) = (7*floor(a(n-1)/3)) + (a(n-1) mod 3) with a(1) = 3.at n=12A338852