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A072018 Numbers k for which gcd(k, reverse(k)) = 243 = 3^5. 2
4899999987, 4989999897, 4999889997, 4999997889, 5889998997, 5889999969, 5898989997, 5898998988, 5899899789, 5899979979, 5899987998, 5899989699, 5899996989, 5979999879, 5988899997, 5988998898, 5989889979, 5989897998 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

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

EXAMPLE

k = 4899999987 = 3*3*3*3*3*157*128437 and reverse(k) = 78999999984 = 2*2*2*2*3*3*3*3*3*3*2031893, gcd = 243. Numerous but not all solutions are obtained by inserting strings of 9's between digits of A071016. Further such regular transformations exist.

CROSSREFS

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

Sequence in context: A015384 A233615 A217146 * A227799 A216013 A158726

Adjacent sequences:  A072015 A072016 A072017 * A072019 A072020 A072021

KEYWORD

nonn,base

AUTHOR

Labos Elemer, Jun 05 2002

STATUS

approved

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Last modified April 12 17:06 EDT 2021. Contains 342929 sequences. (Running on oeis4.)