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A072017 Numbers k such that gcd(k, reverse(k)) = 81 = 3^4, where reverse(x) = A004086(x). 0
2899999989, 2989999899, 2999889999, 3799999899, 3898989999, 3899799999, 3899999988, 3979989999, 3988899999, 3989999898, 3989999979, 3998999889, 3999889998, 3999898989, 3999899799, 3999979989, 3999988899, 4699998999 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Numerous solutions can be constructed by inserting strings of suitable digits between digits of terms in A071016.

LINKS

Table of n, a(n) for n=1..18.

EXAMPLE

k = 3*3*3*3*3*449*64157 and reverse(k) = 2*2*3*3*3*3*31*67*14827, GCD = 81.

CROSSREFS

Cf. A004086, A055483, A069554, A071686, A072005, A072016, A072018.

Sequence in context: A327835 A295468 A257913 * A116577 A067615 A204338

Adjacent sequences:  A072014 A072015 A072016 * A072018 A072019 A072020

KEYWORD

nonn,base

AUTHOR

Labos Elemer, Jun 05 2002

STATUS

approved

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Last modified May 17 20:44 EDT 2021. Contains 343989 sequences. (Running on oeis4.)