28756

Appears in sequences

• a(n) = (2*n+1)*(7*n+1).at n=45A033572
• Numbers whose base-13 representation has exactly 5 runs.at n=12A043660
• a(n) = Sum_{d|4} phi(d)*n^(4/d).at n=13A054603
• Smallest multiple of n beginning with n and having a digit sum n, or 0 if no such number exists.at n=27A077727
• Number of n X 3 0..1 arrays avoiding 0 0 0 and 0 1 1 horizontally and 0 0 1 and 1 1 0 vertically.at n=25A207106
• Number of tetrahedra in the n X n queen graph.at n=12A388998