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EXAMPLE
| {n,2^n+5^n}: {0,2}, {1,7}, {2,29}, {3,133}, {4,641}, {5,3157}, {6,15689}, {7,78253}, {9,1953637}, {10,9766649}, {12,244144721}, {16,152587956161}, {17,762939584197}, {18,3814697527769}, {30,931322574616552257449}, {37,72759576141834396472156597}, {58,34694469519536141888238777858214286477369}.
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MATHEMATICA
| Do[p=2^n+5^n; If[FreeQ[IntegerDigits[p], 0], Print[{n, p}]]], {n, 0, 2000}]
Select[Range[10000], DigitCount[2^#+5^#, 10, 0]==0&] (* From Harvey P. Dale, Oct 14 2011 *)
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