47564

Appears in sequences

• Sum of the prime factors of k equals half the sum of the prime factors of k + 1.at n=22A074213
• a(n) = (1/24)*(n+1)*(n+6)*(n^3+26*n^2+225*n+636).at n=11A090948
• Numbers k such that k^2 divides 21^k-1.at n=43A128401
• Smallest even number k such that lpf(k-3) = prime(n) while lpf(k-1) > lpf(k-3), where lpf=least prime factor (A020639).at n=44A242490
• Number of length 4+3 0..n arrays with some disjoint pairs in every consecutive four terms having the same sum.at n=12A247536
• Even numbers such that the sum of the even divisors and the sum of the odd divisors are a square or a cube.at n=36A263695
• Numbers n such that n and n+1 both have 24 divisors.at n=25A274362
• Numbers k such that k and k+1 both have the prime signature (2,1,1,1) (A189982).at n=11A336658
• Numbers k such that sigma(k) = psi(k) + tau(k)^3.at n=20A390297