60456

Appears in sequences

• Numbers n such that sigma(n) = sigma(n-1) + sigma(n-2).at n=6A065900
• If M(n) is the n-th Mersenne prime, then a(n) is the smallest positive integer such that 2*a(n)*M(n)*M(n+1)*M(n+2)-1 is prime.at n=21A093192
• Numbers n not of the form i^2+(i+1)^2 such that there are integers a < b with a^2+(a+1)^2+...+(n-1)^2 = n^2+(n+1)^2+...+b^2.at n=28A094523
• Number of even-length columns in all bargraphs having semiperimeter n (n>=2).at n=10A273904
• Solutions k of the equation isigma(k) = isigma(k-1) + isigma(k-2) where isigma(k) is the sum of the infinitary divisors of k (A049417).at n=7A332975