1012736

Appears in sequences

• Reciprocal Chebyshev polynomial of second kind evaluated at 4 multiplied by (-1)^n.at n=10A025171
• Least number k such that n divides gcd(sigma(k), phi(k), tau(k)).at n=10A307640
• Least number k such that n divides gcd(sigma(k), phi(k), tau(k)).at n=21A307640
• a(n) = 4^n sin(nC)/sqrt(15), where B is the angle opposite side CA in a triangle ABC having sidelengths |BC|=2, |CA| = 3, |AB| = 4; ABC is the smallest integer-sided scalene triangle.at n=11A375885