15370304

Appears in sequences

• Numbers m whose abundance sigma(m) - 2m = -4. Numbers whose deficiency is 4.at n=11A125246
• Ceiling(n/2)-perfect numbers.at n=34A177050
• Deficient numbers with increasing abundancy without being powers of 2.at n=18A228450
• Numbers k such that k - 2 | sigma(k).at n=14A298563
• Positive numbers n for which A000120(n) = k*A294898(n), with k < 0; numbers for which A326130(n) = sigma(n) - A005187(n).at n=9A326131
• Numbers n for which A294898(n) is not zero and A294898(n) divides A000120(n); numbers for which A326130(n) = abs(A294898(n)).at n=40A326132
• Numbers k such that A005187(k) < sigma(k) <= 2k, where A005187(k) = 2k - {binary weight of k}.at n=10A326138