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

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

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: A295468 A257913 A346495 * A116577 A067615 A204338

Adjacent sequences: A072014 A072015 A072016 * A072018 A072019 A072020

Keyword

nonn,base

Author

Labos Elemer, Jun 05 2002

Status

approved