perplexus.info :: Just Math : A formal proof requested

A formal proof requested (Posted on 2018-09-13)

Every integer greater than 11 is a sum of two composite numbers.

PROVE IT.

No Solution Yet Submitted by Ady TZIDON

Rating: 3.0000 (1 votes)

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QED (spoiler)

| Comment 1 of 2

All integers above 11 are either odd or even.

Every odd number above 11 is the sum of 9 + an even number greater than than 2. Both of these are composite.

Every even number above 11 is the sum of 8 + an even number greater than than 2. Both of these are composite.

QED

Posted by Steve Herman on 2018-09-13 10:22:53

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