721525

Appears in sequences

• Number of distinct n X 2 toroidal 0..6 arrays.at n=3A184329
• Table read by antidiagonals: T(n,k) = number of distinct n X k toroidal 0..6 arrays.at n=11A184331
• Table read by antidiagonals: T(n,k) = number of distinct n X k toroidal 0..6 arrays.at n=13A184331
• Pairs of primitive deficient numbers having the same value of sigma(k)/k, listed by increasing value of the larger of the two k values.at n=11A212610
• The larger companion to the primitive deficient numbers in A212611.at n=5A212612
• Numbers k such that 2*k+1 and 5*k+1 are both pentagonal numbers (A000326).at n=1A279275