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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A015787 Numbers n such that phi(n) + 8 | sigma(n + 8), where phi = A000010 and sigma = A000203. 1
 2, 18, 22, 34, 46, 48, 58, 94, 106, 132, 150, 166, 178, 180, 187, 214, 274, 346, 358, 394, 448, 466, 488, 526, 550, 562, 616, 624, 634, 660, 664, 744, 756, 772, 778, 782, 790, 798, 884, 886, 898, 934, 1138, 1174, 1186, 1354, 1366, 1438, 1618 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS From Robert Israel, Jul 23 2020: (Start) The first odd terms are 187, 2407, 98587, 388315. If p > 5 is in A228353 then 2*p is in the sequence. (End) LINKS Robert Israel, Table of n, a(n) for n = 1..10000 MAPLE select(t -> numtheory:-sigma(t+8) mod (numtheory:-phi(t)+8)=0, [\$1..2000]); # Robert Israel, Jul 23 2020 PROG (PARI) is(n)=!(sigma(n+8)%(eulerphi(n)+8)) \\ Charles R Greathouse IV, Sep 25 2012 CROSSREFS Cf. A000010, A000203, A228353. Sequence in context: A266956 A092587 A247457 * A322489 A063430 A031104 Adjacent sequences: A015784 A015785 A015786 * A015788 A015789 A015790 KEYWORD nonn AUTHOR Robert G. Wilson v EXTENSIONS Corrected by Charles R Greathouse IV, Sep 25 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 | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified June 8 18:04 EDT 2023. Contains 363165 sequences. (Running on oeis4.)