212795

Appears in sequences

• Numbers k such that (sigma(k)+sigma(k+1))/sigma(2*k+1) is an integer, where sigma = A000203.at n=16A091287
• Integer solutions x to sigma(x) + sigma(x+1) = 2*sigma(2x+1) where sigma = A000203.at n=9A091289
• Numbers k such that abundance(k) + abundance(k+1) = 2.at n=11A137205