193708801

Appears in sequences

• Composite numbers k such that phi(k)*lambda(k) divides (k-1)^2, where phi(k) = A000010(k) and lambda(k) = A002322(k).at n=4A277366
• Composite numbers k such that phi(k) divides d*(k - 1) for some squarefree divisor d of k - 1.at n=18A337316
• Carmichael numbers k for which the 2-adic valuation of phi(k) does not exceed the 2-adic valuation of k-1.at n=23A339818
• Starts of runs of 3 consecutive Carmichael numbers (A002997) without a non-prime-power weak Carmichael number (A087442) between any two consecutive members.at n=8A365024