The "integer core" of a number is found by adding the digits

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The "integer core" of a number is found by adding the digits of a given number continuously until there is a
the "integer core" of a number is found by adding the digits of a given number continuously until there is a single digit remaining.for example,the integer core of 3577 is 4 because 3+5+7+7=22 and 2+2=4.what is the largest number less than 1,000 with an integer core of

在“整数核心数字”的发现,添加了一定数目的数字不断,直到有一
在“整数核心数字”的发现,添加某一号码数字不断,直到有一位数字剩下的.例如,在3577整数的核心是4,因为3 +5 +7 +7 = 22和2 +2 = 4.什么是最大的数字为1的整数核心不到1000?
it's must be 9100
它必须是9100

The "integer core" of a number is found by adding the digits T is the ten digits of a two-digit positive integer if n is a positive integer,how many of the ten digits from 0 英语翻译The sum of the digits of a two-digit number is subtracte the reflection of a positive integer is obtained by reversin 英语翻译if the product of all digits of a six-digit number is 12 Call a positive integer N a 7-10 double if the digits of the 请问 find the number two-digit positive integer whose digits t Number of digits to the right of the decimal point. 外国的数学题!I am a 2-digit number. the product of my 2 digits 24. 看不懂the number of primes of which 11 is an integer multipleth hrice a number is greater than 3/4 of the number by 81 ,find