20804

Appears in sequences

• Molien series for group H_{1,3}^{8} of order 2304.at n=41A051531
• Non-balanced numbers in A015771.at n=33A078549
• Numbers k such that (k / sum of digits of k) and (k+1 / sum of digits of k+1) are both semiprime.at n=36A085774
• Numbers k such that Sum_{j=1..k-1} j*2^(j-1) is prime.at n=11A119529
• Number of (w,x,y) with all terms in {0,...,n} and |w-x| != |x-y|.at n=27A212960
• Number of integer partitions of n whose product is a powerful number.at n=44A330106
• Array read by diagonals downwards: A(n,k) for n>=2 and k>=0 is the number of (n,k)-polyominoes counting as distinct different formations of transparent squares.at n=47A381057