83640

Appears in sequences

• Number of collinear point-triples in an n X n grid.at n=18A000938
• Number of prime powers (p^2, p^3, ...) <= 2^n.at n=39A036386
• Even legs of Pythagorean triangles whose other leg and hypotenuse are both prime.at n=17A067755
• Numbers that define integer Heronian triangles [prime(a(n)), prime(a(n)+1), A068965(n)] with area A068966(n).at n=40A068964
• Even numbers k such that the central binomial coefficient A000984(k, k/2) is divisible by k^2.at n=38A080395
• a(n) is a non-palindromic composite located between twin primes whose reverse, which is less than it, is also located between twin primes.at n=35A103741
• Number of acute isosceles triangles on an n X n grid.at n=17A190317