28309

Properties

Appears in sequences

• Numbers k such that the continued fraction for sqrt(k) has period 97.at n=18A020436
• T(n,n-4), array T as in A038792.at n=29A038794
• a(n)=sum(k=1,n,C(n,n reduced (mod k))).at n=15A072953
• Expansion of (1-x)/(1-2*x+x^2+2*x^3).at n=21A078002
• Noncomposite numbers in the western ray of the Ulam spiral as oriented on the March 1964 cover of Scientific American.at n=14A168025
• Denominator of the mean of all parts of all partitions of n.at n=31A236361
• Primes of the form p+q+r where p < q < r = p+6 are consecutive primes.at n=34A309354
• Primes p such that p=prime(k), prime(k+1), and prime(k+2) end in the same digit.at n=28A328452
• Primes p such that, if q is the next prime, p + q^2 is a prime times a power of 10.at n=25A352837
• a(n) = sum of the first n primes whose distance to next prime is 4.at n=48A360226
• Primes which are sums of a prime triple (p, p+4, p+6).at n=15A377406
• Prime numbersat n=3084