72981

Appears in sequences

• Numbers k that divide the (right) concatenation of all numbers <= k written in base 9 (most significant digit on left).at n=28A029454
• Numbers k such that sigma(k^2+1) is a perfect square.at n=20A067465
• Expansion of (1-x)/(1-x+x^2+x^3).at n=38A078016
• Concatenation of n^3 and n^2.at n=8A239461
• Number of collections of nonempty multisets with a total of n objects of exactly three colors.at n=8A255943
• Number of collections of nonempty multisets with a total of n+8 objects of exactly n colors.at n=3A255958
• a(n) = -(A(n) - A(n-1)) where A(n) = A057597(n+1), for n >= 0.at n=37A319200
• Odd numbers k for which gcd(A325977(k), A325978(k)) is equal to abs(A325978(k)).at n=2A325979