2146992128

Appears in sequences

• Numbers whose abundance is 14.at n=5A141546
• Numbers k such that sigma(k) == 0 (mod k+7).at n=6A274559
• Practical numbers (A005153) that are abundant and have a record low value of abundancy index.at n=28A362052
• Primitive abundant numbers k (A071395) whose abundancy index sigma(k)/k has a record low value.at n=31A362053
• a(n) = 2^(2*n - 1) - 2^(n - 1)*(n - 1).at n=16A376585