20117

Properties

Appears in sequences

• Discriminants of real quadratic fields with class number 1 and related continued fraction period length of 21.at n=25A051962
• Numbers k such that 73^k - 72^k is prime.at n=3A062639
• List of primitive prime divisors of the Somos-4 sequence (A006720) in their order of occurrence.at n=25A129741
• Primes congruent to 57 mod 59.at n=38A142784
• Primes congruent to 48 mod 61.at n=38A142846
• Prime numbers that contain the string "2011" in their decimal expansion.at n=3A191421
• Primes p such that q = p^2 + 10 and q^2 + 10 are also prime.at n=24A243368
• Primes of form n^2 + 14641.at n=8A256839
• Smallest prime modulus p such that there exists a multiplicative-coset Ramsey algebra in n colors over Z/pZ, or 0 if no such prime exists.at n=46A263308
• Prime numbers representing a date based on the proleptic Gregorian calendar in YY..YMMDD format.at n=35A352947
• Smallest k such that A365092(k) = n.at n=33A365093
• Prime numbersat n=2275