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A152520
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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).
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0
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OFFSET
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1,2
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LINKS
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EXAMPLE
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{n, 2^n+5^n}:{1,7}, {3,133}, {4,641}, {8,390881}, {10,9766649}, {11,48830173}.
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MATHEMATICA
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Do[If[Intersection[IntegerDigits[p=2^n+5^n], {2, 5}]=={}, Print[{n, p}]], {n, 0, 2000}]
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CROSSREFS
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KEYWORD
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base,nonn
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AUTHOR
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STATUS
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approved
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