250563

Appears in sequences

• Numbers k that divide the (right) concatenation of all numbers <= k written in base 17 (most significant digit on left).at n=21A029462
• G.f. A(x) satisfies: A(x*G098618(x)) = G098618(x), where G098618 is the g.f. for A098618(n) = A007482(n)*Catalan(n).at n=9A098619
• Numbers k such that previous_prime(k)=k-sd and next_prime(k)=k+sd where sd is sum of the distinct prime factors of k.at n=17A125841
• Number of 2 X 2 matrices having all terms in {1,...,n} and positive odd determinant.at n=33A211068
• Number of (w,x,y,z) with all terms in {1,...,n} and w<2x and y>=2z.at n=34A212505
• a(n) = 3*n^4.at n=17A219056