219520

Appears in sequences

• Triangle whose (i,j)-th entry is binomial(i,j)*7^(i-j)*8^j.at n=17A038274
• Triangle whose (i,j)-th entry is binomial(i,j)*8^(i-j)*7^j.at n=18A038285
• Numbers whose sum of nonunitary divisors and sum of unitary divisors are both positive squares.at n=5A064730
• Seventh column of triangle A067425.at n=4A067427
• Triangle read by rows: T(n,k)=k^3*2^k*binomial(2n-k,n-k)/(2n-k) (1<=k<=n).at n=42A112327
• a(n) = Pell(n)*A000143(n) for n>=1 with a(0)=1, where A000143(n) is the number of ways of writing n as a sum of 8 squares.at n=6A209444
• The greedy sequence of real numbers at least 1 that do not contain any 6-term geometric progressions with integer ratio.at n=18A235057
• a(n) = 10*n^3.at n=28A244729
• Numbers k = a * b, such that k' = a' * b' where k', a' and b' are the arithmetic derivatives of k, a and b.at n=28A294153