640847

Properties

Appears in sequences

• Primes expressible as concatenation of phi(sigma(n)) and sigma(phi(n)).at n=29A228444
• Primes expressible as concatenation of phi(sigma(n)) and sigma(phi(n)).at n=31A228444
• Compositions with superdiagonal growth: number of compositions (p0, p1, p2, ...) of n with pi - p0 >= i.at n=55A238861
• Prime numbersat n=52136