A071016 -id:A071016 - cp's OEIS frontend

A072018 Numbers k for which gcd(k, reverse(k)) = 243 = 3^5.

4899999987, 4989999897, 4999889997, 4999997889, 5889998997, 5889999969, 5898989997, 5898998988, 5899899789, 5899979979, 5899987998, 5899989699, 5899996989, 5979999879, 5988899997, 5988998898, 5989889979, 5989897998

Offset: 1

Labos Elemer, Jun 05 2002

			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.

Sean A. Irvine, Table of n, a(n) for n = 1..1000

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

A072017 Numbers k such that gcd(k, reverse(k)) = 81 = 3^4, where reverse(x) = A004086(x).

Original entry on oeis.org

2899999989, 2989999899, 2999889999, 3799999899, 3898989999, 3899799999, 3899999988, 3979989999, 3988899999, 3989999898, 3989999979, 3998999889, 3999889998, 3999898989, 3999899799, 3999979989, 3999988899, 4699998999

Offset: 1

Labos Elemer, Jun 05 2002

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

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

Sean A. Irvine, Table of n, a(n) for n = 1..1000

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

cp's OEIS Frontend

A072018 Numbers k for which gcd(k, reverse(k)) = 243 = 3^5.

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