390001

Properties

Appears in sequences

• Duodecimal primes: p = (x^12 + y^12 )/(x^4 + y^4 ).at n=6A006687
• Cyclotomic polynomials at x=5.at n=24A019323
• Cyclotomic polynomials at x=-5.at n=24A020504
• 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 49.at n=20A031637
• a(n) = n^4 - n^2 + 1.at n=25A060886
• a(n) = n^8 - n^4 + 1.at n=5A060893
• Zsigmondy numbers for a = 5, b = 1: Zs(n, 5, 1) is the greatest divisor of 5^n - 1^n (A024049) that is relatively prime to 5^m - 1^m for all positive integers m < n.at n=23A064081
• Largest prime factor of 5^n + 1.at n=12A074478
• Largest prime factor of 5^n - 1.at n=23A074479
• Smallest prime divisor of n^4-n^2+1.at n=23A125258
• a(n) is the least prime such that the multiplicative order of 5 mod a(n) equals n.at n=23A143665
• A239461(n) / n^2.at n=38A239464
• Greatest prime factor of n^6+1.at n=24A240549
• Expansion of a(q)^2 * (c(q)/3)^3 in powers of q where a(), c() are cubic AGM theta functions.at n=24A266288
• Primes of the form Phi(k, -5), where Phi is the cyclotomic polynomial.at n=5A291998
• Primes of the form Phi(k, 5), where Phi is the cyclotomic polynomial.at n=6A292009
• a(n) = sigma_8(n^2)/sigma_4(n^2).at n=4A372966
• Prime numbersat n=33068