39105

Appears in sequences

• Odd integers m such that phi(m) | sigma(m).at n=19A015715
• Numbers n such that the arithmetic, geometric and harmonic means of phi(n) and sigma(n) are all integers.at n=20A065146
• Numbers k such that sigma(k) = 4*phi(k).at n=16A068390
• Numbers k such that sigma(k) = phi(k)*omega(k).at n=11A073567
• Numbers k such that both k and 2*k are balanced numbers (A020492).at n=28A076375
• Numbers k such that k, 2*k and 4*k are balanced numbers (A020492).at n=12A076376
• Numbers k such that k, 2*k, 4*k and 8*k are balanced numbers (A020492).at n=4A076377
• a(n) = n^3 + 6*n^2 + 6*n + 1.at n=32A090197
• Integers n such that sigma(n)/phi(n) is a perfect square.at n=30A293391
• Numbers m such that both m^2-1 and m^2 are refactorable numbers (A033950) and that m^2 has more divisors than m^2-1.at n=17A342970
• Expansion of e.g.f. log( 1 + x^2 * exp(x) / 2 ).at n=10A346750