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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A113194 Numbers k such that Lucas(k) - Lucas(i) is composite for i=0..k-3. 9
 5, 7, 10, 17, 19, 23, 29, 31, 34, 41, 44, 49, 53, 55, 57, 62, 67, 68, 71, 75, 77, 79, 80, 87, 89, 93, 98, 100, 101, 103, 107, 109, 110, 116, 122, 124, 125, 133, 134, 135, 136, 143, 147, 154, 155, 160, 161, 164, 167, 170, 173, 177, 180, 184, 185, 188, 190, 194, 196 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS These are the numbers k such that A113193(k) = 0. LINKS Robert Israel, Table of n, a(n) for n = 1..2600 MAPLE Luc:= 2, 1, 3: R:= NULL: count:= 0: a:= 1: b:= 3: for n from 3 while count < 100 do c:= a+b; a:= b; b:=c; Luc:= Luc, c; if ormap(isprime, [seq(c-Luc[i], i=1..n-2)]) then next fi; R:= R, n; count:= count+1; od: R; # Robert Israel, Jan 18 2023 MATHEMATICA lst={}; Do[i=0; While[i

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 March 31 05:00 EDT 2023. Contains 361630 sequences. (Running on oeis4.)