DAY 299

Today’s Challenge

Which is the only 2-digit number to have exactly seven factors?

. . . and an additional challenge for the number puzzle enthusiast – which is the only 3-digit number to have exactly seven factors?

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The 7puzzle Challenge

The playing board of the 7puzzle game is a 7-by-7 grid containing 49 different numbers, ranging from 2 up to 84.

The 4th & 5th rows of the playing board contain the following fourteen numbers:

3     6     7     10     16     21     32     35     44     50     54     60     81     84

What is the sum of the two square numbers?

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Answers

. . . can be found when clicking this.

7puzzleblog

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