875520

Appears in sequences

• Numbers k such that phi(k) + 2 | sigma(k + 2).at n=35A015781
• Integers of the form k = m^3-m^2 such that k-+1 are primes.at n=9A154731
• Expansion of chi(q)^5 / chi(q^5) in powers of q where chi() is a Ramanujan theta function.at n=39A225701