279377281

Appears in sequences

• Carmichael numbers (A002997) that are not minimal in their family.at n=19A335584
• Carmichael numbers k for which the 2-adic valuation of phi(k) does not exceed the 2-adic valuation of k-1.at n=26A339818
• Carmichael numbers k for which bigomega(phi(k)) < bigomega(k-1), where bigomega gives the number of prime divisors, counted with multiplicity.at n=4A339909