19841

Properties

Appears in sequences

• Molien series for 3-D group X1.at n=24A037240
• Smallest prime factor of 10^n + 1.at n=32A038371
• Primes such that prime(p) +- pi(p) are simultaneously prime.at n=33A065117
• Rounded total surface area of a regular dodecahedron with edge length n.at n=31A071397
• Primes p such that the period of the decimal expansion of 1/p is a square.at n=26A072858
• Primes p for which the period of 1/p is a power of 2.at n=13A072982
• Smallest member of a pair of consecutive twin prime pairs that have three primes between them.at n=26A089635
• Alternating row sums of array A091534 (generalized Stirling2 array (5,2)).at n=3A091537
• Upper prime of a difference of 22 between consecutive primes.at n=35A098976
• a(n) = 1 if 10^(2^n)+1 is prime, otherwise smallest prime factor of 10^(2^n)+1.at n=5A102050
• Primes of the form 256n+129.at n=20A105130
• Primes p such that there exist three primes q, r and s with p^3=q^3+r^3+s^3.at n=28A114923
• Real part of (1 + n*i)^5.at n=8A121671
• Primes of the form 10k+1 generated recursively. Initial prime is 11. General term is a(n)=Min {p is prime; p divides (R^5 - 1)/(R - 1); Mod[p,5]=1}, where Q is the product of previous terms in the sequence and R = 5Q.at n=12A124991
• Primes p for which the period length of 1/p is a perfect power, A001597.at n=34A128948
• Primes p for which Sum_{1 <= n < p} (n!|p) == 0 (mod p), where (n!|p) is the Legendre symbol.at n=33A131652
• Positive numbers of the form x^5-10x^3*y^2+5x*y^4 (where x,y are integers and y>x).at n=15A135792
• Numbers of the form x^5-10x^3*y^2+5x*y^4 (where x,y are integers).at n=21A135793
• Primes congruent to 17 mod 59.at n=37A142744
• Primes congruent to 16 mod 61.at n=35A142814