80953

Properties

Appears in sequences

• a(n) is equal to the number of positive integers m less than or equal to 10^n such that m is not divisible by at least one of the primes 2,3 and is not divisible by at least one of the primes 5,7.at n=3A128959
• Primes p such that p+-2 and p+-3 are not squarefree.at n=32A153214
• Primes p such that q = 2*p^3-1 and 2*p*q^2-1 are both prime.at n=27A224614
• Primes obtained by merging 5 successive digits in the decimal expansion of sqrt(2) + sqrt(3) + sqrt(5).at n=3A241221
• Prime numbersat n=7923