68963

Properties

Appears in sequences

• a(n) = Sum_{d|n} sigma(n/d)*d^3.at n=40A027847
• Primes that can be written as 1+p+p^k, p prime and k > 1.at n=26A084444
• Primes of the form n^3 + n + 1.at n=16A095692
• The number of n-almost primes less than or equal to 10^n, starting with a(0)=1.at n=6A116430
• Number of 6-almost primes less than or equal to 10^n.at n=6A120047
• Triangle read by rows: T(k,n) is number of numbers <= 10^n that are products of k primes.at n=52A126280
• Primes of the form ((p-1)/2)^3+((p+1)/2), p are prime numbers.at n=13A163421
• a(n) = prime(n)^3 + prime(n) + 1.at n=12A181150
• Numbers n such that the decimal expansions of both n and n^2 have 3 as the digit with the smallest value and 9 as the digit with the largest value.at n=27A238553
• a(n) = Sum_{d|n} d^3*A000593(n/d).at n=40A288419
• Number of nX6 0..1 arrays with every element equal to 0, 2, 3 or 6 king-move adjacent elements, with upper left element zero.at n=13A297984
• a(n) is the least prime > a(n-2) such that a(n-1)+a(n) is a square.at n=46A359582
• Prime numbersat n=6853