1152921

Appears in sequences

• Triangular numbers in which the k-th significant digit either divides k or is a multiple of k.at n=38A069559
• a(n) = (n+1)*(n+2)^2*(n+3)*(n+4)*(3*n+5)/240.at n=19A114243
• Number of ways to choose two points on a centered hexagonal grid of size n.at n=22A241219
• First of three consecutive triangular numbers that add up to a perfect square.at n=6A319588
• Numbers k such that k^2 is an odd primitive abundant number (A006038).at n=13A379950
• Numbers k such that k^2 is abundant but d*k is nonabundant for any proper divisor d of k.at n=22A381742