login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A249505 Primes p such that p+1 is a totient (i.e., in A000010). 1

%I #12 Aug 10 2017 11:13:28

%S 3,5,7,11,17,19,23,29,31,41,43,47,53,59,71,79,83,101,103,107,109,127,

%T 131,137,139,149,163,167,179,191,197,199,211,223,227,239,251,263,269,

%U 271,281,293,311,331,347,359,367,379,383,419,431,439,443,461,463,467,479,491,499,503

%N Primes p such that p+1 is a totient (i.e., in A000010).

%C Primes of the form phi(m) - 1 for some m. A001359 is a subsequence. - _Thomas Ordowski_, Aug 10 2017

%H Charles R Greathouse IV, <a href="/A249505/b249505.txt">Table of n, a(n) for n = 1..10000</a>

%o (PARI) select(p->istotient(p+1), primes(200))

%Y Cf. A000010, A078892.

%K nonn

%O 1,1

%A _Joerg Arndt_, Oct 30 2014

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified April 25 12:15 EDT 2024. Contains 371969 sequences. (Running on oeis4.)