2618880

Appears in sequences

• a(n) = 2*(n+1)*binomial(n+2,4).at n=29A027777
• Numbers k such that gcd(sigma(k),k) = k/5.at n=21A067237
• Numbers k for which sigma(k)/k - 3/5 is an integer.at n=3A218408
• Half of the height of the right trapezoidal gnomon (of the derivative of Y=X^5).at n=31A281999
• Numbers k such that k divides lcm(tau(k), sigma(k)).at n=26A307740
• Numbers k such that A048675(sigma(k)) is equal to A048675(2*k).at n=39A331751
• El Gradechi's hybrid coefficients alpha^{4,4}_{2n}.at n=15A331768