A062376 Numbers k such that Euler phi(k) / Carmichael lambda(k) = 8.

80, 120, 160, 168, 195, 208, 255, 260, 264, 272, 280, 312, 320, 336, 340, 360, 390, 400, 408, 416, 420, 435, 440, 456, 464, 510, 528, 552, 555, 580, 592, 595, 600, 615, 616, 640, 656, 660, 663, 672, 696, 697, 715, 740, 744, 760, 765, 792, 795, 800, 820

Offset: 1

Author

Vladeta Jovovic, Jun 17 2001

Keywords

• easy
• nonn

Comments

Solutions to A000010(n)/A002322(n)=8.

Links

• Amiram Eldar, Table of n, a(n) for n = 1..10000

Crossrefs

Cf. A000010, A002322, A034380, A033948, A062373, A062374, A062375, A062377.

Programs

PARI

{cmf(f)=if( ((f[1]==2)&&(f[2]>2)),eulerphi(f[1]^f[2])/2, eulerphi(f[1]^f[2])) }
{cl(f)= k=factor(f); l=1; for(x=1,omega(f),l=lcm(l,cmf([k[x,1], k[x,2]]))); l }
{A062376(n)=eulerphi(n)/cl(n)}
for(x=1,1000, if(A062376(x)==8, print1(x,", ")))

Extensions

More terms from Randall L Rathbun, Jan 12 2002