42331

Properties

Appears in sequences

• Number of primes <= product of first n primes, A002110(n).at n=7A000849
• Numbers n such that sigma(reversal(n)) = reversal(sigma(n)). Ignore leading 0's.at n=18A069514
• Numbers of the forms 4*p or q where both numbers p=(10^n-7)/3 and q=(127*10^(n-1)-7)/3 are primes.at n=5A102589
• Primes from merging of 5 successive digits in decimal expansion of cos(1).at n=21A104961
• Primes p of the form : p+p^2+p^3-+4=prime.at n=14A154822
• The cost of all leaves in the Fibonacci tree of order n.at n=17A178521
• Primes of the form 6*k^2 - 5.at n=24A201791
• Primes of the form 2*n^2 + 10*n + 3.at n=17A221902
• Triangle read by rows: T(n, k) is the number of squarefree integers x such that x<=primorial(n) and omega(n) = k with 0<=k<=n.at n=29A261215
• Values of odd prime numbers, D, for incrementally largest values of minimal x satisfying the equation x^2 - D*y^2 = -2.at n=38A336790
• Values of odd prime numbers, D, for incrementally largest values of minimal positive y satisfying the equation x^2 - D*y^2 = -2.at n=37A336792
• a(n) is the least prime p such that (p^2-2*n)/(2*n-1) and (p^2+2*n)/(2*n+1) are both prime, or 0 if such p does not exist.at n=41A344463
• Prime numbersat n=4425