A284089 Smallest number k such that gcd(phi(k), k-1) = n * lambda(k).

1, 2465, 314821, 15841, 658801, 41041, 21584305, 8830801, 8911, 11205601, 3193414093, 1729, 9653421961, 1193229577, 1232469001, 69331969, 1419339691, 46657, 587034735001, 9439201, 64774081, 67047668161, 100929219805, 7995169, 1894344001, 212027401, 67371265, 3057601

Offset: 1

Author

Altug Alkan and Thomas Ordowski, Mar 24 2017

Keywords

• nonn

Comments

For n > 1, a(n) is a Carmichael number.

a(19) <= 587034735001. - Giovanni Resta, Mar 24 2017

Links

• Amiram Eldar, Table of n, a(n) for n = 1..138

Crossrefs

Cf. A000010, A002322, A002997, A049559, A264024.

Programs

Mathematica

m=10; s=Table[0,{m}]; c=0; k=0; While[cAmiram Eldar, Jun 26 2019 *)

Extensions

a(7)-a(18) from Giovanni Resta, Mar 24 2017

a(19)-a(28) from Amiram Eldar, Jun 26 2019