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A241198 Denominator of new minima of phi(p-1)/(p-1), where phi is Euler's totient function and p = prime(n). 3
1, 2, 3, 15, 35, 77, 1463, 1309, 1001, 4147, 2093, 19019, 17017, 39767, 35581, 323323, 10023013, 1339481, 676039, 20957209, 2800733, 86822723 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

The values of p are in A241196. The numerator is in A241197.

LINKS

Table of n, a(n) for n=1..22.

MATHEMATICA

tMin = {{2, 1}}; Do[p = Prime[n]; tn = EulerPhi[p - 1]/(p - 1); If[tn < tMin[[-1, -1]], AppendTo[tMin, {p, tn}]], {n, 10^7}]; Denominator[Transpose[tMin][[2]]]

CROSSREFS

Cf. A008330 (phi(prime(n)-1)), A073918, A241194, A241195.

Sequence in context: A244330 A342867 A060753 * A296296 A143880 A037388

Adjacent sequences:  A241195 A241196 A241197 * A241199 A241200 A241201

KEYWORD

nonn,frac,more

AUTHOR

T. D. Noe, Apr 17 2014

EXTENSIONS

a(20)-a(22) from Giovanni Resta, Apr 14 2016

STATUS

approved

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Last modified May 27 03:13 EDT 2022. Contains 354093 sequences. (Running on oeis4.)