254012
domain: N
Appears in sequences
- Primitive weird numbers: weird numbers with no proper weird divisors.at n=15A002975
- Numbers k such that sigma(k) == 8 (mod k).at n=13A045770
- The floor(n/2)-perfect numbers, where f-perfect numbers for an arithmetical function f are defined in A066218.at n=9A066240
- Numbers k with abundance radius of 8, i.e., abs(sigma(k)-2*k) = 8.at n=19A088820
- Numbers k whose abundance is 8: sigma(k) - 2*k = 8.at n=9A088833
- Admirable numbers whose abundance is < 10.at n=24A109788
- Admirable numbers such that the subtracted divisor is square.at n=24A109806
- Near-multiperfects with primes, powers of 2, 6 * prime and 2^n * prime excluded, abs(sigma(n) mod n) <= log(n).at n=25A117350
- Weird numbers (A006037) not divisible by 5.at n=13A138850
- Primitive weird numbers (pwn) (A002975) whose abundance (A033880) is a power of 2 (A000079).at n=12A258250
- Primitive weird numbers (A002975) of the form 2^k*p*q*x with k >= 0 and odd p, q, x >= 3.at n=5A258401
- Primitive weird numbers (PWN) of the form 2^k*p*q*r with k > 0 and where p < q < r are odd primes.at n=5A258883
- Numbers k such that sigma(k) == 0 (mod k+4).at n=12A274553
- Primitive weird numbers (pwn; A002975) divisible by 4 but not 8.at n=4A322524
- Weird admirable numbers: numbers that are both weird (A006037) and admirable (A111592).at n=13A329190
- Weird numbers k such that k+1 is the sum of a subset of the aliquot divisors of k.at n=14A354282