30191

Appears in sequences

• Numbers k such that sigma(k) = phi(k) + phi(k-1).at n=6A067198
• Least k such that k(k+1)(k+2)...(k+n) divides C(2k,k).at n=11A072119
• a(n) = pq + pr + qr with p = prime(n), q = prime(n+1), and r = prime(n+2).at n=24A127345
• Composites in A127345.at n=13A127347
• Number of nX4 0..1 arrays with every element unequal to 0, 2, 3 or 4 king-move adjacent elements, with upper left element zero.at n=7A303884
• T(n,k)=Number of nXk 0..1 arrays with every element unequal to 0, 2, 3 or 4 king-move adjacent elements, with upper left element zero.at n=58A303888
• T(n,k)=Number of nXk 0..1 arrays with every element unequal to 0, 2, 3, 4 or 8 king-move adjacent elements, with upper left element zero.at n=58A305281
• Denominator of harmonic mean of 3 consecutive primes. Numerators are A331259.at n=24A331260