124355

Appears in sequences

• Number of exterior points formed by extending diagonals of n-gon in general position.at n=32A005701
• Odd integers m such that phi(m) | sigma(m).at n=29A015715
• Number of scalars which can be constructed from the Riemann tensor and metric tensor in n dimensions.at n=34A050297
• Numbers n such that sigma(n) = 3*phi(n).at n=9A068391
• Numbers k such that [A070080(k), A070081(k), A070082(k)] is a right integer triangle with relatively prime side lengths.at n=18A070137
• Balanced numbers n such that n mod 12 = 11.at n=1A110596
• a(n) = n*(n-1)*(n-2)*(n+3)/12.at n=35A117662
• a(n) = n*Fibonacci(n) - Sum_{i=0..n-1} Fibonacci(i).at n=20A190062
• Nonnegative values x of solutions (x, y) to the Diophantine equation x^2 + (x+289)^2 = y^2.at n=18A207059
• Numbers k such that gcd(sigma(k), phi(k)) (A009223) attains record values.at n=32A222711
• Product of primes appearing in the factorization of n! with even exponents.at n=45A240502
• Product of the smaller primes, p, in the Goldbach partitions of 2n such that p + q = 2n, p <= q, and p,q prime (or 1 if no Goldbach partition of 2n exists).at n=23A362641