11972017

Appears in sequences

• Numbers k such that (k-1) mod phi(k) = lambda(k), where phi = A000010 and lambda = A002322.at n=1A290281
• Carmichael numbers k such that phi(k) divides (k-1)*lambda(k).at n=28A306338
• Carmichael numbers ending in 7.at n=6A355307
• 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=17A365023