66720

Appears in sequences

• Numbers k such that sigma(phi(k)) = k-phi(k).at n=5A070171
• Amicable triples: numbers such that sigma(x) = sigma(y) = sigma(z) = x+y+z, x<y<z. We order these triples according to the common value of sigma. Sequence gives x numbers.at n=12A125490
• Sum of the three largest parts in the partitions of 4n into 4 parts.at n=13A243011
• Numbers k such that (349*10^k - 7)/9 is prime.at n=24A284595