51711

Appears in sequences

• Least positive integer k such that both k and k*n belong to the set {m>0: 2*prime(prime(m))+1 = prime(p) for some prime p}.at n=21A261362
• Number of n X 4 0..1 arrays with every element unequal to 0, 1, 2, 4 or 7 king-move adjacent elements, with upper left element zero.at n=8A304844
• Composite numbers k coprime to 13 such that k divides A006190(k) - Kronecker(13,k).at n=39A327654
• a(n) = 2*a(n-1) + 1 for a(n-1) not prime, otherwise a(n) = prime(n) - 1; with a(1)=1.at n=34A374965