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Problem 348


Problem 348


Sum of a square and a cube

Many numbers can be expressed as the sum of a square and a cube. Some of them in more than one way.

Consider the palindromic numbers that can be expressed as the sum of a square and a cube, both greater than 1, in exactly 4 different ways.
For example, 5229225 is a palindromic number and it can be expressed in exactly 4 different ways:

22852 + 203
22232 + 663
18102 + 1253
11972 + 1563

Find the sum of the five smallest such palindromic numbers.


平方数和立方数之和

许多数可以表示称一个平方数和一个立方数之和,有些数甚至有不止一种表示方式。

考虑能表示成大于1的平方数和立方数之和,且恰好有4种不同的表示方式的回文数。
例如,5229225是一个回文数,而且它恰好可以用4种不同的方式进行表达:

22852 + 203
22232 + 663
18102 + 1253
11972 + 1563

求出这类回文数中最小的五个之和。