89775

Appears in sequences

• Fibonacci sequence beginning 4, 19.at n=19A022135
• Numbers k such that both k and k+1 are abundant.at n=24A096399
• Numbers k such that both sigma(k) >= 2*k-1 and sigma(k+1) >= 2*(k+1)-1.at n=26A103289
• Triangle read by rows: The Bell transform of the quartic factorial numbers (A007696).at n=30A265606
• Number of orbits of Aut(Z^7) as function of the infinity norm n of the representative lattice point of the orbit, when the cardinality of the orbit is equal to 161280.at n=21A266395
• Numbers k such that k = rad(k) * sopfr(k), where rad(k) is the squarefree kernel of k and sopfr(k) the integer log of k.at n=35A280935
• Numbers k such that both k and k+1 are Zumkeller numbers (A083207).at n=22A328327
• Numbers k such that k and k+1 are both S-abundant numbers (A181487).at n=8A364861
• a(n) is the smallest integer k such that [1,2,...,k] contains a set of n but no more disjoint consecutive subsequences, each having element sum k.at n=30A378718
• Numbers k such that k and k+1 both have an odd number of abundant divisors.at n=8A381548
• Numbers k such that each of k and k+1 is either a practical number (A005153) or an almost practical number (A174533).at n=15A387654