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A103162 GCD of reversed(3^n) and reversed[3^(n+1)]. 0
3, 9, 18, 18, 9, 9, 36, 9, 27, 27, 9, 9, 9, 9, 9, 27, 9, 63, 9, 9, 9, 9, 27, 18, 36, 9, 9, 18, 18, 18, 9, 9, 9, 9, 4941, 9, 9, 9, 9, 9, 9, 9, 9, 9, 144, 18, 9, 153, 333, 63, 18, 9, 27, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 18, 18, 9, 9, 18, 18, 18, 9, 9, 9, 9, 9, 9, 9, 9, 9, 81, 9, 9, 9, 9, 54 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..89.

FORMULA

a(n)=GCD[A004167(n), A004167(n+1)]

EXAMPLE

These common divisors are always divisible by 3.

MATHEMATICA

rd[x_] :=FromDigits[Reverse[IntegerDigits[x]]] Table[GCD[rd[3^w], rd[3^(w+1)]], {w, 1, 100}]

CROSSREFS

Cf. A004167.

Sequence in context: A009216 A103072 A109228 * A310331 A261952 A066006

Adjacent sequences:  A103159 A103160 A103161 * A103163 A103164 A103165

KEYWORD

base,nonn

AUTHOR

Labos Elemer, Jan 25 2005

STATUS

approved

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Last modified June 22 04:06 EDT 2021. Contains 345367 sequences. (Running on oeis4.)