72996

Appears in sequences

• Number of nonnegative solutions of x1^2 + x2^2 + ... + x12^2 = n.at n=18A045853
• Numbers k such that the three second-degree cyclotomic polynomials x^2 + 1, x^2 - x + 1 and x^2 + x + 1 are simultaneously prime when evaluated at x=k.at n=35A087277
• a(n) = (n/2)*Sum_{k=1..n} C(n + k, n)*C(k, n - k)/k.at n=7A298700
• Least k such that p = k^2 + 1 and q = (k+2n)^2 + 1 are two consecutive prime numbers of the same form with q - p square.at n=11A339008
• Integers k such that there exists an integer 0<m<k such that (1/sigma(m)^2 + 1/sigma(k)^2)*(m+k)^2 = 1.at n=19A383964