243119

Properties

Appears in sequences

• Triple-safe primes p: p, (p-1)/2, (p-3)/4, and (p-7)/8 are all prime.at n=21A157358
• Primes p such that p^2 + 6, p^2 + 12 and p^2 + 18 are all prime.at n=33A173627
• Number of ways to reciprocally link elements of an nX4 array either to themselves or to exactly one horizontal, diagonal and antidiagonal neighbor.at n=4A220617
• T(n,k)=Number of ways to reciprocally link elements of an nXk array either to themselves or to exactly one horizontal, diagonal and antidiagonal neighbor.at n=32A220621
• Number of ways to reciprocally link elements of an 5Xn array either to themselves or to exactly one horizontal, diagonal and antidiagonal neighbor.at n=3A220624
• p-INVERT of (1,0,1,0,0,0,0,...), where p(S) = 1 - S - S^3.at n=20A291735
• Primes p that are simultaneously of the forms 2*q+1, 4*r+3, 6*s+5 and 8*t+7 where q,r,s,t are primes.at n=7A328799
• Prime numbersat n=21476