20935

Appears in sequences

• Numbers k such that sigma(k) = sigma(k+10).at n=25A015880
• a(n) = (n/3 + 7/9)*2^(n - 1) + (-1)^n/9.at n=12A127984
• Binomial transform of [1, 4, 6, 4, 1, 1, -1, 1, -1, 1, ...].at n=22A140227
• Expansion of 1 / ( (1+x)*(2*x+1)*(-1+2*x)^2 ).at n=12A140787
• Numbers m with C(2*m, m) + prime(m) prime, where C(2*m, m) = (2*m)!/(m!)^2.at n=47A236242