359905

Appears in sequences

• Start of consecutive solutions of phi(x) = phi(x+2). That is, phi(a(n)) = phi(a(n)+2) and phi(a(n)+1) = phi(a(n)+3).at n=1A050938
• Numbers k such that phi(k) + phi(k+3) = phi(k+1) + phi(k+2).at n=20A076665
• Pentagonal numbers (A000326) that are the product of 2 palindromes greater than 1.at n=33A115745
• Odd numbers k such that phi(k) = phi(k+2), where phi is the Euler totient function (A000010).at n=19A333741