56598313

Properties

Appears in sequences

• Primes p such that 10^(p-1) == 1 (mod p^2).at n=2A045616
• Numbers k which divide the periodic part of the decimal expansion of 1/k.at n=6A171928
• Numbers k>1 such that 10^phi(k) == 1 (mod k^2), where phi(n)=A000010(n).at n=8A241977
• Prime numbersat n=3371851