英语意思：numbers in which the sum of its digits is a perfect square

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• 英语意思：numbers in which the sum of its digits is a perfect square
• 英语翻译A positive integer is called a perfect power if it can be written in the form a^b (a的b次方),where a and b are positive integers with b>=(大于或等于).for example,32 and 125 are perfect powers because 32=2^5 and 125=5^3The increasing sequence2,3,5,6,7,10,.consists of all positive integers which are not perfect powers.the sum of the digits of the 1000th number in this sequence is(A)50 (B)48 (C)52 (D)54 (E)56我在国外读书..中国人出的?
• 英语意思：numbers in which the sum of its digits is a perfect square
• 英语翻译Ponder This Challenge:N lamps are set in a circle,and for each integer M you have a tool that can toggle the state (on/off) of any set of M consecutive lamps.Find a possible N which satisfies the following statements:The sum of its digits is less than 10.By applying the tool for M=105 several times,we can toggle a single lamp.If we remove one lamp and start from a random initial setting for the remaining N-1 lamps,the probability that there exists
• name the place value of the digit 3
• the square root of（（-5）的平方）