Dreamshire

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 28, 2009 ⋅ 6 comments

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

By Mike Molony ⋅ May 5, 2009 ⋅ 6 comments

Find the first four consecutive integers to have four distinct primes factors.

By Mike Molony ⋅ June 5, 2009 ⋅ 2 comments

Find arithmetic sequences, made of prime terms, whose four digits are permutations of each other.

By Mike Molony ⋅ April 12, 2009 ⋅ 5 comments

Find the prime number, below one-million, that can be written as the sum of the most consecutive primes.

By Mike Molony ⋅ April 11, 2009 ⋅ Post a comment

Count the values of C(n,r), for 1 ≤ n ≤ 100, that exceed one-million.

By Mike Molony ⋅ May 5, 2009 ⋅ One comment

Find the minimal path sum from the left column to the right column.

By Mike Molony ⋅ July 19, 2011 ⋅ 11 comments

Investigating a square digits number chain with a surprising property.

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