227893

Properties

Appears in sequences

• Number of labeled graded partially ordered sets with n elements of height at most 1.at n=7A001831
• Square loops: the number of circular permutations (reversals not counted as different) of the numbers 1 to n such that the sum of any two consecutive numbers is a square.at n=16A071984
• prime(k) for those k where floor((2*(prime(k+1)-prime(k))*PrimePi(k) mod (8*k))/k) = m with m = 12.at n=24A109566
• Primes p such that q-p = 54, where q is the next prime after p.at n=21A204666
• Triangular array read by rows. T(n,k) is the number of idempotent binary relations on [n] having no proper power primitive (A360718) with exactly k irreflexive points.at n=17A370208
• Prime numbersat n=20255