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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). 0
1, 3, 4, 8, 10, 11 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..6.

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

Cf. A074600, A007496, A152493.

Sequence in context: A253606 A258640 A185726 * A239976 A191193 A327185

Adjacent sequences:  A152517 A152518 A152519 * A152521 A152522 A152523

KEYWORD

base,nonn

AUTHOR

Zak Seidov, Oct 25 2009

STATUS

approved

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Last modified January 25 22:56 EST 2020. Contains 331270 sequences. (Running on oeis4.)