Dreamshire

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Solutions 10 – 50

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By Mike Molony ⋅ April 8, 2009 ⋅ 3 comments

How many circular primes are there below one million?

By Mike Molony ⋅ March 29, 2009 ⋅ Post a comment

Find the sum of all numbers less than one million, which are palindromic in both base 10 and base 2.

By Mike Molony ⋅ April 23, 2009 ⋅ 10 comments

Find the sum of all eleven primes that are truncatable from both left to right and right to left.

By Mike Molony ⋅ March 26, 2009 ⋅ 3 comments

What is the largest 1 to 9 pandigital that can be formed by multiplying a fixed number by 1, 2, 3, … ?

By Mike Molony ⋅ April 22, 2009 ⋅ 7 comments

Find the value of p ≤ 1000 which produces the most integer right triangles.

By Mike Molony ⋅ May 25, 2009 ⋅ 2 comments

Compose Champernowne’s constant

By Mike Molony ⋅ March 26, 2009 ⋅ 2 comments

Find the largest n-digit pandigital prime that exists

By Mike Molony ⋅ April 27, 2009 ⋅ One comment

Count how many ‘triangle words’ a list of common English words contain.

By Mike Molony ⋅ April 28, 2009 ⋅ 6 comments

Find the sum of all pandigital numbers with an unusual sub-string divisibility property.

By Mike Molony ⋅ April 17, 2009 ⋅ 6 comments

Find the smallest pair of pentagonal numbers whose sum and difference is pentagonal.

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