221884001

Appears in sequences

• Carmichael numbers that are not == 1 mod 12. There are 69 Carmichael numbers out to 2*m+1, m=2*10^6 and all but the above 9 are 1 mod 12.at n=24A110889
• Carmichael numbers not congruent to 1 modulo 6.at n=14A205947
• Carmichael numbers whose prime factors all have the form p=1+x^2+y^2 for some x,y in Z.at n=12A258839
• Carmichael numbers k for which the 2-adic valuation of phi(k) does not exceed the 2-adic valuation of k-1.at n=25A339818