login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A217141 Numbers n such that phi(n) = phi(n+12) and are not divisible by 2. 5
143, 157, 203, 247, 273, 1147, 1209, 1679, 2147, 2279, 2375, 2445, 2705, 2747, 4331, 4687, 5049, 6107, 7367, 7835, 7869, 7979, 7991, 9167, 12127, 17145, 18501, 18753, 18981, 19803, 22987, 26733, 27359, 29097, 29987, 32829, 35485, 35763, 37653, 37851, 39907 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Donovan Johnson, Table of n, a(n) for n = 1..1000

PROG

(PARI) {op=vector(N=12); Nd6=N/6; for( n=1, 1e4, if( op[n%N+1]+0==op[n%N+1]=eulerphi(n), if ((n-N) % Nd6 != 0, print1(n-N, ", "))))}

CROSSREFS

Cf. A000010, A179188, A217139.

Sequence in context: A296887 A293755 A160781 * A097435 A073954 A227868

Adjacent sequences:  A217138 A217139 A217140 * A217142 A217143 A217144

KEYWORD

nonn

AUTHOR

Michel Marcus, Sep 27 2012

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified November 21 06:00 EST 2019. Contains 329350 sequences. (Running on oeis4.)