57104

Appears in sequences

• Numbers k such that 171*2^k+1 is prime.at n=20A032462
• Numbers m such that sigma(m+1)+sigma(m-1) = 6*phi(m).at n=16A067243
• a(n) = Sum_{i=1..n} (-1)^(i+1) prime(i)^3.at n=15A242188