28282

Appears in sequences

• a(n) is the index of the smallest triangular number containing exactly n 9's.at n=4A048364
• Numbers whose consecutive digits differ by 6.at n=32A048408
• Number of partitions of n into at most 1 copy of 1, 2 copies of 2, 3 copies of 3, ... .at n=50A052335
• Palindromic even numbers with an odd number of distinct prime factors.at n=38A075809
• a(n) = concatenate(n, A010888(2*n), reverse(n)), where A010888 = digital root.at n=27A082944
• Partial sums of binomials bin(3n,n)^2/(2n+1).at n=4A188682
• Floor(6^n/(1+1/(2*cos(5*Pi/11)))^n).at n=36A240840
• Consider a decimal number of k>=2 digits x = d_(k)*10^(k-1) + d_(k-1)*10^(k-2) + … + d_(2)*10 + d_(1) and the transform T(x)-> (d_(k)+d_(k-1) mod 10)*10^(k-1) + (d_(k-1)+d_(k-2) mod 10)*10^(k-2) + … + (d_(2)+d_(1) mod 10)*10 + (d_(1)+d(k) mod 10). Sequence lists the numbers x such that T(x)=0.at n=28A243994
• Numbers with digits 2 and 8 only.at n=40A284922
• Expansion of 1/(1 + x * Sum_{k>=1} prime(k)*x^k).at n=27A307899
• Palindromes (A002113) in A157037.at n=41A353703