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A177874 The number of decimal digits in the Lucas-Lehmer number A003010(n). 2
1, 2, 3, 5, 10, 19, 37, 74, 147, 293, 586, 1172, 2343, 4686, 9371, 18742, 37484, 74967, 149933, 299866, 599731, 1199461, 2398922, 4797844, 9595688, 19191376, 38382751, 76765501, 153531001, 307062002, 614124003, 1228248006, 2456496012 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..32.

FORMULA

a(n) = A055642(A003010(n)).

MATHEMATICA

a=Sqrt[6]; Table[a=a^2-2; Length[IntegerDigits[a]], {n, 0, 20}]

IntegerLength/@NestList[#^2-2&, 4, 33] (* Harvey P. Dale, Jan 19 2018 *)

PROG

(MAGMA) T:=[ n eq 1 select 4 else Self(n-1)^2-2: n in [1..24] ]; [ #Intseq(T[n]): n in [1..#T] ];

CROSSREFS

Cf. A003010.

Sequence in context: A078715 A166874 A046630 * A293353 A293328 A064236

Adjacent sequences:  A177871 A177872 A177873 * A177875 A177876 A177877

KEYWORD

nonn,base

AUTHOR

G. L. Honaker, Jr., Dec 13 2010

EXTENSIONS

a(21) - a(24) from Klaus Brockhaus, Dec 13 2010

a(25) - a(32) from D. S. McNeil, Dec 13 2010

STATUS

approved

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Last modified November 13 12:45 EST 2019. Contains 329094 sequences. (Running on oeis4.)