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What is the most happy number?

The first few happy numbers are 1, 7, 10, 13, 19, 23, 28, 31, 32, 44, 49, 68, 70, 79, 82, 86, 91, 94, 97, 100, ...

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Let the sum of the squares of the digits of a positive integer be represented by . In a similar way, let the sum of the squares of the digits of be represented by , and so on. Iterating this sum-of-squared-digits map always eventually reaches one of the 10 numbers 0, 1, 4, 16, 20, 37, 42, 58, 89, or 145 (OEIS A039943; Porges 1945). If for some , then the original integer is said to be happy. For example, starting with 7 gives the sequence 7, 49, 97, 130, 10, 1, so 7 is a happy number. The first few happy numbers are 1, 7, 10, 13, 19, 23, 28, 31, 32, 44, 49, 68, 70, 79, 82, 86, 91, 94, 97, 100, ... (OEIS A007770). These are also the numbers whose 2-recurring digital invariant sequences have period 1. The numbers of iterations required for these to reach 1 are 0, 5, 1, 2, 4, 3, 3, 2, 3, 4, 4, 2, 5, ... (OEIS A090425). The numbers of happy numbers less than or equal to 1, , , ... are given by 1, 3, 20, 143, 1442, 14377, 143071, ... (OEIS A068571). The first few consecutive happy numbers have , 129, 192, 262, 301, 319, 367, 391, ... (OEIS A035502). Similarly, the first few happy triplets start with 1880, 4780, 4870, 7480, 7839, ... (OEIS A072494). The first few happy primes are 7, 13, 19, 23, 31, 79, 97, 103, 109, 139, ... (OEIS A035497). Once it is known whether a number is happy (or not), then any number in the sequence , , , ... will also be happy (or not). A number that is not happy is called unhappy. Unhappy numbers have eventually periodic sequences of which never reach 1. Any permutation of the digits of an unhappy or happy number must also be unhappy or happy. This follows from the fact that addition is commutative.

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What's a nice number?

A nice number is an integer ending in 3 or 7 when written out in decimal.

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Lets try elimination :

Numbers ending by 3 or 7 are odd.So they must consists of factors ending by {1, 3, 5, 7, 9}.(excluding even numbers) Numbers having 5 as their factor will lead to numbers ending with 0 and 5 only. Hence the number must have factors ending with {1, 3, 7, 9} Numbers ending with 1 might or might not be there in the factors list as multiplying 1 will result in the same number.Hence {3, 7, 9}. Numbers ending with 9 alone cannot be there as the prime factors because 9 * 3 = 27 and 9 * 7 = 63 i.e 9 needs numbers ending with either 3 or 7 with it to satisfy the definition of nice number. Hence for the factors of a nice number ,numbers ending with either of {3, 7} are a must.

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