91969

Properties

Appears in sequences

• Number of ordered quadruples of integers from [ 2,n ] with no global factor.at n=37A015638
• The n-th term of n-th inverse binomial transform of this sequence is 1 for n>=0.at n=8A138911
• Number of n X n binary arrays with all ones connected only in a 1100-1111-0010 pattern in any orientation.at n=7A146698
• Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1100-1111-0010 pattern in any orientation.at n=16A146700
• Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1100-1111-0010 pattern in any orientation.at n=17A146700
• Middle of 3 consecutive prime numbers such that p1*p2*p3 + d1 + d2 - 1 = average of twin prime pairs, d1 (delta) = p2 - p1, d2 (delta) = p3 - p2.at n=21A153404
• Primes of the form 2*n^2 + 22*n + 9.at n=23A154601
• Primes where every other digit is 9 starting with the rightmost digit, and no other digit is 9.at n=28A348561
• Number of maximal irredundant sets in the n-Lucas cube graph.at n=6A390537
• Prime numbersat n=8886