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# PS-Subtraction of Powers

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Manager
Joined: 21 May 2008
Posts: 85
PS-Subtraction of Powers [#permalink]

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27 Sep 2008, 23:54
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Director
Joined: 23 May 2008
Posts: 799
Re: PS-Subtraction of Powers [#permalink]

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28 Sep 2008, 00:15
7

4^17-2^28=
(2^2)^17-2^28=
2^34-2^28=
2^28(2^6-1)=
2^28(63)

2 is the only prime in 2^28
7 and 3 are primes of 63
Re: PS-Subtraction of Powers   [#permalink] 28 Sep 2008, 00:15
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# PS-Subtraction of Powers

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