29746

Appears in sequences

• Composite and even n such that phi(n) * sigma(n) is one less than a square.at n=25A015721
• G.f. A(x) satisfies A(x) = 1 + x*A(x)^2*(A(x) + A(-x))/2.at n=9A217138
• Number of partitions p of n such that (number of numbers of the form 3k in p) is a part of p.at n=41A241546
• Composite numbers k such that phi(k) * psi(k) + 1 is a perfect square, where phi is the Euler totient function (A000010) and psi is the Dedekind psi function (A001615).at n=39A309653