8378368

Appears in sequences

• Numbers k such that sigma(k) == 4 (mod k).at n=12A045769
• Numbers k such that sigma(k) == 0 (mod k+2).at n=10A067702
• Numbers k whose abundance is 4: sigma(k) - 2*k = 4.at n=9A088832
• Admirable numbers such that the subtracted divisor is prime.at n=14A109766
• Admirable numbers whose abundance is < 10.at n=32A109788
• (N\{4})-perfect numbers, i.e., numbers m for which sigma(m)-4 = 2m, if 4|m, otherwise sigma(m) = 2m.at n=7A181597
• Near-perfect numbers (A181595) of the form 2^(t-1)*(2^t-2^k-1), where 2^t-2^k-1 is prime, k>=1, t>k.at n=27A181701
• Numbers m=2^(t-1)*(2^t-5), where 2^t-5 is prime.at n=5A181704
• Admirable numbers such that the subtracted divisor is a Fibonacci number.at n=33A282754
• Practical numbers (A005153) that are abundant and have a record low value of abundancy index.at n=21A362052
• Primitive abundant numbers k (A071395) whose abundancy index sigma(k)/k has a record low value.at n=22A362053