53823

Appears in sequences

• Smallest number such that n-th iterate of Chowla function is 0.at n=29A002954
• a(n) = n*(n+1)*(n^2 + n + 4)/4.at n=21A061316
• Numbers n such that phi(n)+phi(n+1)=n+1.at n=31A067798
• a(n) = 64*n^2 - 1.at n=28A158684
• Sum(m^p, m=1..p-1)/p as p runs through the odd primes.at n=2A219550
• Numbers k such that tau(k+1) - tau(k) = 5, where tau(k) = the number of divisors of k (A000005).at n=29A228453
• Number of (n+1)X(1+1) 0..2 arrays x(i,j) with row sums sum{j*x(i,j), j=1..1+1} nondecreasing, and column sums sum{i*x(i,j), i=1..n+1} nondecreasing.at n=7A232775
• T(n,k)=Number of (n+1)X(k+1) 0..2 arrays x(i,j) with row sums sum{j*x(i,j), j=1..k+1} nondecreasing, and column sums sum{i*x(i,j), i=1..n+1} nondecreasing.at n=28A232778
• Numbers n such that the number of divisors of n+1 divides n and the number of divisors of n divides n+1.at n=7A272353
• Composite numbers k coprime to 13 such that k divides A006190(k) - Kronecker(13,k).at n=40A327654