191100

Appears in sequences

• Numbers k such that sigma(k+1) = 5*phi(k).at n=15A067263
• Ooguri-Vafa invariants of disk degeneracies for brane III in the O(K) -> P^1 x P^1 geometry.at n=10A092719
• Ooguri-Vafa invariants of disk degeneracies for brane III in the O(K) -> P^1 x P^1 geometry.at n=7A092722
• Denominator of Sum_{k=1..n} H(k)*H(n+1-k), where H(k) is the k-th harmonic number (Sum_{j=1..k} 1/j).at n=13A130895
• Numbers with prime factorization pqr^2s^2t^2.at n=15A190379
• Ordered areas of primitive integer Soddyian triangles.at n=8A210484
• Triangle read by rows, T(n,k) = n!*B(n,k) for n>=0 and 0<=k<=n, where B(n,k) is the Bell matrix with generator 1/j for j>=1.at n=33A265607
• Exponential weird numbers: numbers that are exponential abundant (A129575) but not exponential pseudoperfect (A318100).at n=11A321146
• Coreful weird numbers: numbers k that are coreful abundant (A308053) but no subset of their aliquot coreful divisors sums to k.at n=11A339939