89167

Appears in sequences

• Numbers k such that k | 11^k + 10^k + 9^k + 8^k.at n=18A057240
• Composite numbers whose exponents in their canonical factorization lie in the geometric progression 1, 3, 9, ...at n=33A102838
• Expansion of g.f. (1-6*x)/(1-19*x).at n=4A196665
• Number of (w,x,y,z) with all terms in {1,...,n} and w>2x and y>=3z.at n=39A212519
• Number of subsets of {1,2,...,n-8} without differences equal to 4 or 8.at n=35A224815
• Positive numbers b such that a + b + c = d are abcd quadruples in the "abcd-conjecture" with a < b < c < d, all |a|, b, c, d are pairwise coprime, the quality q of the quadruple has q > 1, term a = +/- 1 = A376149(n) and term c = A376143(n). Quadruples are sorted by c then b.at n=43A376144