A182234 Numbers that are palindromic in bases 2 and 7.

0, 1, 3, 5, 85, 107, 257, 5049, 9201, 11253, 11757, 210099, 399171, 512607, 786435, 12916899, 19992857, 22468309, 1052109663, 15935958711, 24051338445, 37344016593, 71859215265, 72822171105, 1566399158893, 3425211644643

Offset: 1

Author

Alex Ratushnyak, Apr 19 2012

Keywords

• nonn
• base

Comments

Intersection of A006995 and A029954. - Michel Marcus, Oct 09 2014

Examples

			786435 base 2 = 11000000000000000011 and 786435 base 7 = 6453546.
		

Links

• Ray Chandler, Table of n, a(n) for n = 1..31 (terms < 10^18)

Crossrefs

Cf. A006995 (base 2), A029954 (base 7).

Cf. A060792 (base 2 and 3), A097856 (base 2 and 4).

Programs

Mathematica

b1 = 2; b2 = 7; lst = {}; Do[d1 = IntegerDigits[n, b1]; d2 = IntegerDigits[n, b2]; If[d1 == Reverse[d1] && d2 == Reverse[d2], AppendTo[lst, n]], {n, 1000000}]; lst (* T. D. Noe, Apr 19 2012 *)

Extensions

a(19)-a(28) from Donovan Johnson, Apr 27 2012

b-file to 31 terms from Ray Chandler, Oct 27 2014