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A277626 Odd numbers n such that 2^n == phi(n) (mod n). 0
1, 3, 15, 255, 65535, 4139059, 15734689, 66322477, 83623935, 4294967295 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..10.

PROG

(PARI) is(n)=Mod(2, n)^n==eulerphi(n)&&n%2==1;

CROSSREFS

Cf. A000010, A000079, A015910.

Sequence in context: A250405 A116518 A247174 * A050474 A051179 A122591

Adjacent sequences:  A277623 A277624 A277625 * A277627 A277628 A277629

KEYWORD

nonn,more

AUTHOR

Altug Alkan, Dec 11 2016

STATUS

approved

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Last modified August 17 07:59 EDT 2017. Contains 290635 sequences.