75821

Properties

Appears in sequences

• Numerator of Sum_{k=1..n} 1/phi(k).at n=33A028415
• Smaller pair of the primes described in A116074.at n=6A116075
• Prime numbers p of the form 10k+1 for which the quintic polynomial x^5-x-1 modulus p is factorizable into five binomials.at n=14A135842
• Primes p such that 42*p-1, 42*p+1 and 48*p-1, 48*p+1 are twin primes.at n=16A138697
• Prime numbersat n=7470