perplexus.info :: Numbers : Y ask about Y ?

Y ask about Y ? (Posted on 2017-04-04)

(i)Y is a positive integer.
(ii) Y-1 is divisible by 5;
(iii) Y is divisible by 2,3,4,6,7,8 and 9.

What is the smallest Y?.

See The Solution Submitted by Ady TZIDON

Rating: 3.0000 (1 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)

re(2): Another approach

| Comment 5 of 7 |

(In reply to re: Another approach by Ady TZIDON)

The product Y*(Y-1) has all the factors of Y and Y-1. My indirect method looks for potential values which could be the product and solves a quadratic to check. Therefore 5 is included.

Posted by Brian Smith on 2017-04-13 09:22:02

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