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A299107 Probable primes in sequence {s_k(4)}, where s_k(4) = 4*s_{k-1}(4) - s_{k-2}(4), k >= 2, s_0(4) = 1, s_1(4) = 5. 15
5, 19, 71, 3691, 191861, 138907099, 26947261171, 436315574686414344004975231616076636245689199862837798457639364993981991744926792179 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

From a problem in A269254. For detailed theory, see [Hone].

Subsequent terms have too many digits to display.

LINKS

Table of n, a(n) for n=1..8.

Andrew N. W. Hone, et al., On a family of sequences related to Chebyshev polynomials, arXiv:1802.01793 [math.NT], 2018.

FORMULA

a(n) = s_{A299100(n)}(4) = A001834(A299100(n)).

CROSSREFS

A269254, A001834, A294099 (row 4),

Cf. A285992, A299107, A299109, A088165, A117522, A299100, A299101, A113501, A269253, A298675, A298677, A298878, A299045, A299071, A086386.

Sequence in context: A149760 A149761 A149762 * A086386 A289925 A047155

Adjacent sequences:  A299104 A299105 A299106 * A299108 A299109 A299110

KEYWORD

nonn,hard,more

AUTHOR

L. Edson Jeffery, Bob Selcoe and Andrew Hone, Feb 02 2018

STATUS

approved

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Last modified April 21 08:55 EDT 2019. Contains 322328 sequences. (Running on oeis4.)