OFFSET
1,2
EXAMPLE
{n, 2^n+5^n}:{1,7}, {3,133}, {4,641}, {8,390881}, {10,9766649}, {11,48830173}.
MATHEMATICA
Do[If[Intersection[IntegerDigits[p=2^n+5^n], {2, 5}]=={}, Print[{n, p}]], {n, 0, 2000}]
CROSSREFS
KEYWORD
base,nonn
AUTHOR
Zak Seidov, Oct 25 2009
STATUS
approved