32445

Appears in sequences

• Numbers k such that 119*2^k + 1 is prime.at n=15A032409
• 9 times octagonal numbers: a(n) = 9*n*(3*n-2).at n=35A064201
• Odd numbers which can be written in precisely one way as sum of a subset of their proper divisors.at n=1A065235
• The floor(1.001*x)-perfect numbers, where f-perfect numbers for an arithmetical function f are defined in A066218.at n=3A066239
• Odd numbers m whose abundance by absolute value is at most 10, that is, -10 <= sigma(m) - 2m <= 10.at n=11A077374
• Triangle read by rows: T(n,k), n >=1, 0 <= k <= C(n,k), = number of n X n symmetric positive semi-definite matrices with 2's on the main diagonal and 1's and 0's elsewhere and with k 1's above the diagonal.at n=55A083029
• Numbers k such that sigma(k) - 2k = 6.at n=1A087167
• Odd numbers k such that abs(sigma(k)-2k) <= sqrt(k). Abundance-radius = abs(sigma(k)-2k) does not exceed square root of k and k is odd.at n=16A087415
• Odd numbers n such that abs(sigma(n)-2n) <= n^(1/3). Abundance-radius = abs(sigma(n)-2n) does not exceed cubic root of n and n is odd.at n=6A088010
• Even and odd solutions to abs(sigma(x)-2x) <= log(x). Numbers n whose abundance-radius does not exceed log(n).at n=42A088011
• Odd solutions to abs(sigma(k) - 2k) <= log(k). Numbers k whose abundance-radius does not exceed log(k).at n=2A088012
• Numbers k such that sigma(k) == 6 (mod k).at n=6A088834
• Odd admirable numbers: such that sigma(n) = 2n + 2d for some d | n.at n=11A109729
• Admirable numbers such that the subtracted divisor is prime.at n=9A109766
• Admirable numbers whose abundance is < 10.at n=18A109788
• Near-multiperfects with primes excluded, abs(sigma(m) mod m) <= log(m).at n=45A117347
• Near-multiperfects with primes and powers of 2 excluded, abs(sigma(m) mod m) <= log(m).at n=32A117348
• Near-multiperfects with primes, powers of 2 and 6 * prime excluded, abs(sigma(n) mod n) <= log(n).at n=32A117349
• Near-multiperfects with primes, powers of 2, 6 * prime and 2^n * prime excluded, abs(sigma(n) mod n) <= log(n).at n=15A117350
• Nonnegative k such that 3*k + 1 is a perfect cube.at n=15A121628