89657

Properties

Appears in sequences

• Number of 2 X 2 nonsingular 0..n matrices with a(1,1) <= a(1,2) <= a(2,1) <= a(2,2).at n=35A183763
• Number of permutations of [n] with exactly two (possibly overlapping) occurrences of some of the consecutive step patterns UUD, UDU, DUU (U=up, D=down).at n=9A228408
• Number T(n,k) of permutations of [n] with exactly k (possibly overlapping) occurrences of some of the consecutive step patterns UUD, UDU, DUU (U=up, D=down); triangle T(n,k), n>=0, 0<=k<=max(0,n-3), read by rows.at n=26A231384
• Primes p such that p+2, 3*p+2 and 3*p+8 are also primes.at n=33A278138
• Perimeter-magic hexagons of order 3 with magic sum n.at n=12A380964
• Prime numbersat n=8683