142155

Appears in sequences

• n is equal to the number of 1's in all numbers <= n written in base 9.at n=10A014884
• Numbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 29.at n=12A031707
• Odd numbers divisible by exactly 9 primes (counted with multiplicity).at n=13A046322
• a(n) = T(n)^2 - n^2, where T(n) is a triangular number.at n=27A085740
• An eighth of the product of three integers surrounding the (n+1)-st prime, minus half of the product of the 3 numbers surrounding n+1.at n=26A141535
• a(n) = 841*n^2 + 2*n.at n=12A158403
• G.f. is the polynomial (Product_{k=1..26} (1 - x^(3*k)))/(1-x)^26.at n=5A162718
• Numbers k that divide Sum_{j|k} j^(k/j).at n=35A343982