80707214

Appears in sequences

• Numbers that are the sum of 2 positive 9th powers.at n=27A003391
• a(n) = 2*7^(n-1).at n=9A109808
• a(n) = 7*a(n-2), a(0) = 1, a(1) = 2.at n=19A123752
• Denominator of Euler(n, 1/7).at n=9A156192
• Numbers n such that the n-th cyclotomic polynomial has a root mod 7.at n=37A245479
• Numbers k such that the Diophantine equation x^3 + y^3 + z^3 = k has nontrivial primitive parametric solutions.at n=14A338932
• Numbers k such that the Diophantine equation x^3 + y^3 + 2*z^3 = k has nontrivial primitive parametric solutions.at n=26A338933