OFFSET
1,1
COMMENTS
From a problem in A269254. For detailed theory, see [Hone].
a(25) > 2*10^5. - Robert Price, Jul 03 2020
LINKS
Andrew N. W. Hone, et al., On a family of sequences related to Chebyshev polynomials, arXiv:1802.01793 [math.NT], 2018.
FORMULA
MATHEMATICA
-1 + Position[Nest[Append[#, 5 #[[-1]] - #[[-2]] ] &, {1, 6}, 2600], _?PrimeQ][[All, 1]] (* Michael De Vlieger, Jul 03 2020 *)
CROSSREFS
KEYWORD
nonn,hard,more
AUTHOR
EXTENSIONS
a(24) from Robert Price, Jul 03 2020
STATUS
approved