209628

Appears in sequences

• a(n) = n^2*(2*n^2 - 1); also Sum_{k=0..n-1} (2k+1)^3.at n=18A002593
• Numbers k such that sigma(phi(sigma(k))) = sigma(k).at n=25A066471
• Smallest triangular number with exactly n divisors, or 0 if no such number exists.at n=29A081978
• Transform of n^3 by the Riordan array (1/(1-x^2), x).at n=35A105636
• Triangular arithmetic on half-squares: b(n)*(b(n) - 1)/2 where b(n) = floor(n^2/2).at n=36A227970
• Triangular numbers that are the product of a square number and a prime number.at n=27A253653
• Smallest positive integer b such that b^(2^n)+1 is divisible by the square of A035089(n+1).at n=13A261117
• Triangular numbers k such that psi(k) is a square, where psi(k) is the Dedekind psi function (A001615).at n=36A292064