A152520 Numbers n such that the decimal expansion of 2^n+5^n contains no 2's and no 5's (probably 11 is the last term).

1, 3, 4, 8, 10, 11

Offset: 1

Author

Zak Seidov, Oct 25 2009

Keywords

• base
• nonn

Examples

			{n, 2^n+5^n}:{1,7}, {3,133}, {4,641}, {8,390881}, {10,9766649}, {11,48830173}.
		

Crossrefs

Cf. A074600, A007496, A152493.

Programs

Mathematica

Do[If[Intersection[IntegerDigits[p=2^n+5^n],{2,5}]=={},Print[{n,p}]],{n,0,2000}]