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A066695 Euler phi(n) / Carmichael lambda(n) = 12. 0
252, 273, 315, 364, 399, 468, 481, 532, 546, 630, 651, 665, 684, 693, 741, 756, 777, 793, 798, 855, 868, 903, 945, 949, 962, 988, 1001, 1036, 1071, 1085, 1116, 1204, 1209, 1261, 1281, 1287, 1302, 1330, 1332, 1386, 1395, 1404, 1407, 1417, 1449, 1463 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..46.

MATHEMATICA

Select[Range[2000], EulerPhi[#]/CarmichaelLambda[#] == 12 &] (* Alonso del Arte, Apr 17 2017 *)

PROG

(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 }

{A0(n)=eulerphi(n)/cl(n)}

for(x=1, 10001, if(A0(x)==12, print1(x, ", ")))

CROSSREFS

Continuation of A062373, A062374, A062375, A062376, A062377

Sequence in context: A113899 A045182 A046331 * A104396 A207373 A072443

Adjacent sequences:  A066692 A066693 A066694 * A066696 A066697 A066698

KEYWORD

easy,nonn

AUTHOR

Randall L. Rathbun, Jan 12 2002

STATUS

approved

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Last modified February 22 20:03 EST 2019. Contains 320403 sequences. (Running on oeis4.)