157586

Appears in sequences

• Numbers k such that usigma(k) = phi(k)*omega(k), where omega(k) is the number of distinct prime divisors of k.at n=34A063795
• Numbers k such that sigma(k) = bigomega(k) * phi(k).at n=24A067238
• Numbers k such that sigma(k) = phi(k)*omega(k).at n=17A073567
• Numbers n such that sigma(n) = 5*phi(n).at n=17A136547
• Number of alternating permutations on 2n letters that avoid a certain pattern of length 4 (see Lewis, 2012, Appendix, for precise definition).at n=5A217811