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A262361 a(n) = L(L(L(n))), where L(n) are Lucas numbers A000032. 3
4, 1, 7, 29, 1149851, 387739824812222466915538827541705412334749 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

COMMENTS

a(6) = 3393011755..4322744978 has 1208 decimal digits and a(7) = 4437405101..8830136999 has 240305 decimal digits.

LINKS

Alois P. Heinz, Table of n, a(n) for n = 0..5

MAPLE

L:= n-> (<<0|1>, <1|1>>^n. <<2, 1>>)[1$2]:

a:= n-> L(L(L(n))):

seq(a(n), n=0..5);

MATHEMATICA

A262361 = Nest[LucasL, #, 3] &; Array[A262361, 6, 0] (* JungHwan Min, Nov 09 2016 *)

PROG

(Python)

from sympy import lucas as L

def a(n):  return L(L(L(n)))

print([a(n) for n in range(6)]) # Michael S. Branicky, Apr 01 2021

CROSSREFS

Cf. A000032, A005371, A058051.

Sequence in context: A134250 A139045 A349147 * A294791 A084884 A329998

Adjacent sequences:  A262358 A262359 A262360 * A262362 A262363 A262364

KEYWORD

nonn

AUTHOR

Alois P. Heinz, Nov 09 2016

STATUS

approved

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Last modified November 28 04:43 EST 2021. Contains 349400 sequences. (Running on oeis4.)