37716

Appears in sequences

• Numbers n such that phi(4n+1) = sigma(n).at n=13A067234
• Areas of integer Heronian triangles [prime(A068964(n)), prime(A068964(n)+1), A068965(n)].at n=4A068966
• Expansion of x^9/((1-x)*(1-x^2)*(1-x^3))^2.at n=38A117485
• Cascadence of (1+x)^3; a triangle, read by rows of 3n+1 terms, that retains its original form upon convolving each row with [1,3,3,1] and then letting excess terms spill over from each row into the initial positions of the next row such that only 3n+1 terms remain in row n for n>=0.at n=53A120919
• Numbers k such that 5^k mod k = 5^k mod k^2.at n=40A125775
• Numbers k such that k^2 divides 5^k-1.at n=31A127105
• Numbers n such that phi(sigma(n)) + sigma(phi(n)) is the mean value of phi(n) and sigma(n).at n=1A230238