31863

Appears in sequences

• Concatenations C1 and C2 and C3 and C4 are all prime (see the comment lines).at n=11A034819
• a(n) = Sum_{i=0..floor(n/2)} A047080(n,i).at n=18A047082
• a(n) = Sum_{i=0..floor((n+1)/2)} A047080(n,i).at n=18A047083
• p^2-p+1 central polygonal numbers with prime indices A002061(prime(n)).at n=40A119959
• Number of nondecreasing arrangements of n+3 numbers in 0..5 with each number being the sum mod 6 of three others.at n=14A183900
• Central polygonal numbers that are nontrivially the product of two central polygonal numbers.at n=16A203173
• Number of ways to place nonintersecting diagonals in convex (n+3)-gon so as to create exactly one triangle.at n=10A253192
• Partial sums of A140091.at n=38A267370
• Expansion of e.g.f. 1 / (exp(-3*x) - x).at n=5A336948