Prove that the numbers of the sequence `121, 12321,1234321, ........... ` are each a perfect square of odd integer.

Prove that the number of the sequence 121,12321,1234321,...... are each a perfect square of odd integer.

Write the sequence of perfect squares.

Prove that the arithmetic sequence 7,11,15, ………. does not contain perfect square.

Express 121 as the sum of 11 odd numbers.

Express 121 as the sum of 11 odd numbers.

Prove that the arithmetic sequence 5,8,11,…... contains no perfect squares.

Express 121 as the sum of 11 odd numbers

What is the vaue of sqrt 121 + sqrt 12321 + sqrt 1234321 + sqrt 123454321

Prove that the sum of the numbers in any group in the following is the square of an odd integer: (1),(1, 3, 5),(1, 3, 5, 7, 9),... .