6049681
domain: N
Appears in sequences
- Carmichael numbers C such that C-1 is not a Niven/Harshad number.at n=19A097061
- Carmichael numbers divisible by 11.at n=10A182090
- Carmichael numbers divisible by 31.at n=15A182151
- Carmichael numbers k such that the odd part of k-1 is squarefree.at n=11A263403
- Composite numbers n such that gcd(phi(n), n-1) = lambda(n), where lambda(n) = A002322(n).at n=32A264012
- Carmichael numbers k such that phi(k) divides (k-1)*lambda(k).at n=19A306338
- The lesser of twin Carmichael numbers: a pair of consecutive Carmichael numbers (A002997) without a non-prime-power weak Carmichael number (A087442) between them.at n=10A365022
- The greater of twin Carmichael numbers: a pair of consecutive Carmichael numbers (A002997) without a non-prime-power weak Carmichael number (A087442) between them.at n=9A365023