A283872 Numbers k such that gcd(phi(k), k-1) > lambda(k)^2.

432046225, 631071001, 4579461601, 8494657921, 53282340865, 80601412609

Offset

1,1

Comments

2320690177 is the only 2 < k < 10^11 such that gcd(phi(k),k-1) = lambda(k)^2. - Giovanni Resta, Mar 24 2017

Links

Table of n, a(n) for n=1..6.

Crossrefs

Cf. A000010, A002322, A049559, A264012, A283656.

Sequence in context: A234396 A017408 A017528 * A233477 A117631 A022229

Adjacent sequences: A283869 A283870 A283871 * A283873 A283874 A283875

Keyword

nonn,more

Author

Thomas Ordowski and Altug Alkan, Mar 24 2017

Extensions

a(3)-a(6) from Giovanni Resta, Mar 24 2017

Status

approved