A358489 Numbers k such that phi(k) = 13! where phi is the Euler totient function (A000010).

6227180929, 6227182993, 6227186509, 6227199361, 6227220691, 6227229637, 6227245393, 6227246107, 6227260969, 6227267713, 6227268799, 6227279341, 6227280491, 6227288461, 6227311397, 6227314111, 6227327761, 6227351861, 6227355097, 6227376241, 6227447761, 6227454979

Offset

1,1

Comments

A055487(13) = 6227180929 is the first term in the sequence.

A165774(13) = 37020293310 is the last term in the sequence.

Links

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

Project Euler, Problem 248. Numbers for which Euler's totient function equals 13!.

Prog

(Python)
from sympy import totient
def isok(k): return totient(k) == 6227020800

Crossrefs

Cf. A000010, A055487, A165774.

Sequence in context: A011524 A172534 A198807 * A281222 A258365 A127342

Adjacent sequences: A358486 A358487 A358488 * A358490 A358491 A358492

Keyword

nonn,fini

Author

Darío Clavijo, Nov 18 2022

Status

approved