133837

Appears in sequences

• Positive integers k such that k divides 12^k - 1.at n=12A014951
• Numbers k such that k | 10^k + 1.at n=15A015958
• Numbers k that divide the (right) concatenation of all numbers <= k written in base 23 (most significant digit on left).at n=31A029468
• Numbers k that divide 7^k + 4^k.at n=16A045592
• Numbers k that divide 6^k + 5^k.at n=18A045595
• Numbers n such that n | 7^n + 6^n + 5^n + 4^n.at n=25A057244
• Numbers n such that n | 9^n + 7^n + 5^n + 3^n.at n=32A063455
• a(n) = n^2*binomial(n,2).at n=22A092364
• a(n) = (prime(n)^4 - prime(n)^3)/2.at n=8A138423
• Numbers n dividing u(n), where the Lucas sequence is defined u(i) = u(i-1) - 3*u(i-2) with initial conditions u(0)=0, u(1)=1.at n=13A228440
• a(n) = Sum_{k=1..n^2, gcd(n,k) = 1} k.at n=22A308474