The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Please make a donation to keep the OEIS running. We are now in our 56th year. In the past year we added 10000 new sequences and reached almost 9000 citations (which often say "discovered thanks to the OEIS"). Other ways to donate

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A276504 Numbers n such that phi(n) = phi(n+11), with Euler's totient function phi = A000010. 3
 7, 11, 27, 33, 45, 63, 135, 165, 285, 304, 345, 765, 855, 964, 1144, 1575, 1744, 2134, 2295, 2805, 6424, 6604, 10725, 23584, 24244, 27645, 28875, 31174, 31354, 35445, 40755, 44164, 46672, 57046, 57057, 61444, 64005, 78975, 82095, 90195 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Kevin Ford, Solutions of phi(n) = phi(n+k) and sigma(n) = sigma(n + k), arXiv:2002.12155 [math.NT], 2020. MATHEMATICA Select[Range[150000], EulerPhi[#] == EulerPhi[# + 11] &] PROG (MAGMA) [n: n in [1..100000] | EulerPhi(n) eq EulerPhi(n+11)]; CROSSREFS Cf. A000010. Cf. similar sequences listed in A276503. Sequence in context: A134043 A102373 A002643 * A039287 A045222 A002810 Adjacent sequences:  A276501 A276502 A276503 * A276505 A276506 A276507 KEYWORD nonn,easy AUTHOR Vincenzo Librandi, Sep 08 2016 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.

Last modified December 1 16:44 EST 2020. Contains 338846 sequences. (Running on oeis4.)