21269

Properties

Appears in sequences

• Denominators of continued fraction convergents to sqrt(617).at n=10A042185
• a(n) = A072181(n) - p, where p is the largest prime < A072181(n) - 1.at n=38A082433
• a(n) = A072181(n) - p, where p is the largest prime < A072181(n) - 1.at n=39A082433
• Primes p such that p-3 and p+3 are divisible by a cube.at n=21A089201
• Primes prime(k) such that (prime(k-1) + prime(k+1) + prime(k+2))/prime(k) = 3.at n=35A094933
• Primes congruent to 41 mod 61.at n=39A142839
• Primes of the form : (p-n)/(n+1)=prime and (n+1)*p+n=prime. n=4.at n=30A152294
• Primes of the form floor(binomial(k,2)/4).at n=35A171574
• a(0)=0, a(1)=0; for n>1, a(n) = a(n-1) + (n-1)*a(n-2) + 1.at n=11A186738
• Total number of parts >= 3 in all partitions of n.at n=29A207033
• Number of partitions of n, where the difference between the number of odd parts and the number of even parts is 2.at n=51A240011
• Least prime p such that prime(p*n)-1 is a square, or 0 if no such p exists.at n=26A259764
• Prime numbersat n=2389