312481

Appears in sequences

• a(n) = 9*a(n-1) - 9*a(n-2) + a(n-3); given a(1) = 1, a(2) = 10, a(3) = 81.at n=6A095004
• Odd squares not in A113659.at n=27A103962
• Numbers n for which the absolute value of the abundance of both n and n^2 is a prime number.at n=32A125237
• Number of 3 X n 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 0 1 and 1 0 1 vertically.at n=9A207600
• Number of nX4 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 0 0 and 0 1 1 vertically.at n=11A207904
• The smaller of a pair of successive powerful numbers (A001694) without any prime number between them.at n=32A240591
• Discriminants with exactly 2 associated cyclic cubic fields.at n=19A343002
• Discriminants with at least 2 associated cyclic cubic fields.at n=19A343024
• Determinant of the pentadiagonal symmetric n X n Toeplitz Matrix with a=b=1, c=2.at n=19A360261