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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A003234 Numbers k such that A003231(A001950(k)) = A001950(A003231(k)) - 1. (Formerly M2714) 13
 3, 8, 11, 16, 19, 21, 24, 29, 32, 37, 42, 45, 50, 53, 55, 58, 63, 66, 71, 74, 76, 79, 84, 87, 92, 97, 100, 105, 108, 110, 113, 118, 121, 126, 129, 131, 134, 139, 142, 144, 147, 152, 155, 160, 163, 165, 168, 173, 176, 181, 186, 189, 194, 197, 199, 202, 207 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS See 3.3 p. 344 in Carlitz link. - Michel Marcus, Feb 02 2014 This is the function named s in [Carlitz]. - Eric M. Schmidt, Aug 14 2014 REFERENCES N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). LINKS L. Carlitz, R. Scoville and T. Vaughan, Some arithmetic functions related to Fibonacci numbers, Fib. Quart., 11 (1973), 337-386. MATHEMATICA a3[n_] := Floor[n (Sqrt[5] + 3)/2]; a5[n_] := Floor[n (Sqrt[5] + 5)/2]; Select[Range[300], a5[a3[#]] == a3[a5[#]]-1&] (* Jean-François Alcover, Jul 31 2018 *) PROG (PARI) A001950(n) = floor(n*(sqrt(5)+3)/2); A003231(n) = floor(n*(sqrt(5)+5)/2); isok(n) = A003231(A001950(n)) == A001950(A003231(n)) - 1; \\ Michel Marcus, Feb 02 2014 (Haskell) a003234 n = a003234_list !! (n-1) a003234_list = [x | x <- [1..],                     a003231 (a001950 x) == a001950 (a003231 x) - 1] -- Reinhard Zumkeller, Oct 03 2014 CROSSREFS Cf. A001950, A003231. Sequence in context: A145837 A111132 A188473 * A047470 A184401 A190251 Adjacent sequences:  A003231 A003232 A003233 * A003235 A003236 A003237 KEYWORD nonn AUTHOR EXTENSIONS More terms from Michel Marcus, Feb 02 2014 Definition from Michel Marcus moved from comment to name by Eric M. Schmidt, Aug 17 2014 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 June 24 18:33 EDT 2021. Contains 345419 sequences. (Running on oeis4.)