19336

Appears in sequences

• Numbers equal to a permutation (or rearrangement) of the digits of the sum of their proper divisors (excluding the proper divisor 1). Rearrangements which cause leading zeros are excluded.at n=12A086248
• Numbers k such that k^2 is a palindrome when written in base 17.at n=38A118651
• Number of planar triangular n X n X n nonnegative integer grids with every similarly oriented 4 X 4 X 4 subtriangle summing to 5.at n=9A154049
• Expansion of (1-(1-9*x)^(1/3))/(4-(1-9*x)^(1/3)).at n=6A202482
• Triangle T(n,m) = coefficient of x^n in expansion of [(1-(1-9*x)^(1/3))/(4-(1-9*x)^(1/3))]^m = sum(n>=m, T(n,m) x^n).at n=21A202483
• Number T(n,k) of equivalence classes of ways of placing k 5 X 5 tiles in an n X n square under all symmetry operations of the square; irregular triangle T(n,k), n>=5, 0<=k<=floor(n/5)^2, read by rows.at n=40A236800
• a(0)=0, a(1)=1, a(n) = min{5 a(k) + (5^(n-k)-1)/4, k=0..(n-1)} for n>=2.at n=20A259669
• Record values of A018799 (Smallest nonnegative integer m such that m! begins with n in base 10).at n=26A279089