755100

Appears in sequences

• Let Oc(n) = A005900(n) = n-th octahedral number. Consider all integer triples (i,j,k), j >= k > 0, with Oc(i) = Oc(j)+Oc(k), ordered by increasing i; sequence gives j values.at n=10A053677
• Number of n X n binary matrices with no zero rows or columns and with n+2 ones.at n=5A055603
• Triangle T(r,n) read by rows: number of n X n (0,1)-matrices with exactly r entries equal to 1 and no zero row or columns.at n=33A104601
• Numbers k such that k and k^2 use only the digits 0, 1, 5, 6 and 7.at n=19A136869