30278

Appears in sequences

• Number of (w,x,y,z) with all terms in {1,...,n} and w*x-y*z<n.at n=15A212108
• a(n) = (2n-1)*a(n-1) + 2*(n-2)*a(n-2).at n=6A271212
• Numbers that are the sum of distinct primorial numbers (A002110) (not including 1).at n=46A290249
• Expansion of Product_{k>=1} 1/(1 + p(k)*x^k), where p(k) = number of partitions of k (A000041).at n=24A316230
• Numbers n such that the arithmetic derivative of A276086(n) is prime.at n=39A328233