26829

Appears in sequences

• Divisors of 9999999999.at n=19A027895
• Expansion of (1-x)^(-1)/(1+2*x^2+2*x^3).at n=25A077895
• Numbers k that are divisors of the number formed by concatenating (k-1), k and (k+1), in that order.at n=30A088877
• Odd composites (including 1 in the count) where the number 1 mod 4 equals the number 3 mod 4.at n=0A093180
• a(n) = 1331*n - 1122.at n=20A157441
• Numbers k such that Sum_{i=1..k} i^6 divides Product_{i=1..k} i^6.at n=30A166606
• Numbers n such that 10^n - 1 divides 10^(10^100) - 10.at n=41A200879
• Numbers n such that n * x/(x-1) produces a rotation of the digits in n for some value of x.at n=25A288669
• Number of tilings of an equilateral triangle of side length n with unit triangles (of side length 1) and exactly two unit "lozenges" or "diamonds" (also of side length 1).at n=12A326367
• Numbers whose reciprocals have period 10.at n=6A345319
• Square array A(n,k), n >= 0, k >= 0, read by antidiagonals downwards, where column k is the expansion of e.g.f. B(x)^k, where B(x) is the e.g.f. of A384787.at n=32A384788