12580864

Appears in sequences

• Numbers n such that sigma(n) is congruent to n mod phi(n).at n=30A066679
• Solutions to k + 2*phi(k) = sigma(k) where phi is A000010 and sigma is A000203.at n=7A076373
• Numbers m such that A076078(m) = m, where A076078(m) equals the number of sets of distinct positive integers with a least common multiple of m.at n=32A097214
• Numbers m such that A076078(m) = m and bigomega(m) >= 2; or in other words, A097214, excluding powers of 2.at n=8A097215
• Numbers n such that A076078(m)=n for some m, excluding powers of 2.at n=23A097416
• Duplicate of A136488.at n=23A135098
• a(n) = 2^n - A005418(n).at n=23A136488
• Integers m such that sigma(m) + sigma(2*m) = 6*m.at n=6A281993
• a(n) is the smallest multiple k of 2^n such that |sigma(k) - 2*k| = 2^n, where sigma = A000203.at n=11A363285