68041

Properties

Appears in sequences

• Numbers k such that the continued fraction for sqrt(k) has odd period and if the last term of the periodic part is deleted the two central terms are both 24.at n=16A031612
• Primes with 22 as smallest positive primitive root.at n=16A061334
• Prime numbers p such that p +- ((p-1)/7) are primes.at n=31A137770
• Primes of the form 2520k + 1 for some k.at n=12A217588
• Primes p of the form p = 1 + 840*k for some k.at n=33A217862
• Primes p of the form p = A161671(k) = A161671(k+1).at n=40A220220
• Primes p such that both (p^2 + 5)/6 and (p^4 + 5)/6 are prime.at n=40A253925
• Primes p such that 2*p + 79 is a square.at n=14A269790
• Centered 21-gonal primes.at n=17A276261
• Numbers k such that -3 is a quadratic residue (not necessarily coprime) modulo k, k + 1, k + 2 and k + 3.at n=39A318527
• Expansion of e.g.f. exp( (exp(x^4) - 1)/x^3 ).at n=9A357965
• Prime numbersat n=6776