19638

Appears in sequences

• Numbers such that the nonzero product of the digits of its 4th power is also a 4th power.at n=8A066734
• Sum of the first n Sophie Germain primes.at n=42A066819
• G.f.: 1/(1 - x/(1 - x^4/(1 - x^9/(1 - x^16/(1 - x^25/(1 - x^36/(1 -...- x^(n^2)/(1 -...))))))), a continued fraction.at n=33A206739
• Complement of A187430 in A000108.at n=12A346380