372960

Appears in sequences

• Denominators of continued fraction convergents to sqrt(221).at n=11A041413
• Triangle read by rows: T(n,k) = Sum_{i=k..n} i!*Stirling2(n,i), n >= 1, 1 <= k <= n.at n=33A084416
• Triangle read by rows: T(n,k)=sum((n+1-i)!*stirling2(n,n+1-i),i=1..k), n>=1, 1<=k<=n.at n=30A084417
• Numbers m such that b^sigma(m) == b^phi(m) == b^numdiv(m) == b^m (mod m) for every integer b.at n=49A277173
• Numbers n having a proper divisor d such that sigma(n) - k*d = k*n. Case k = 4.at n=31A291458
• Square array A(n,k), n >= 0, k >= 0, read by antidiagonals, where column k is the expansion of e.g.f. Product_{i>0} Sum_{j=0..k} x^(j*i)/j!.at n=63A293135
• E.g.f.: Product_{m>0} (1+x^m+x^(2*m)/2!).at n=8A293138
• Primitive 4-abundant numbers: Numbers k such that sigma(k) > 4k (A068404) all of whose proper divisors d are 4-deficient numbers (having sigma(d) < 4d).at n=29A307114
• Primitive terms of A023198: numbers k with the property sigma(k)/k >= 4 that are not divisible by any other number with that property.at n=31A392936