151530401
domain: N
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=21A110889
- Carmichael numbers not congruent to 1 modulo 6.at n=12A205947
- Carmichael numbers n such that n-1 is not a practical number.at n=17A265827
- Carmichael numbers k such that Euler totient function of k (phi(k)) is a perfect square.at n=28A272798