Problem 49778. Determine whether a number is a prime self number

Created by ChrisR

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Integers can be classified as generated numbers or self numbers. A generated number is one that can be expressed as the sum of another number and its digit sum. For example, 15 can be written as 12+(1+2); in other words, 15’s generator is 12. A self number cannot be expressed in this way. 
Write a function to determine whether a number is a prime self number. 

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Last Solution submitted on Nov 29, 2025

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J.R.! Menzinger on 4 Aug 2021

Nice Problem!

but I found remarkable your syntax on test case Nr. 27:
a = arrayfun(@(k) isPrimeSelf(n(k)),1:length(n));

if you use 'arrayfun' you can actually parse the vector directly and you can avoid parsing the indices. The following expression would be more narrow:

a = arrayfun(@isPrimeSelf,n)

ChrisR on 28 Aug 2021

Thanks for pointing that out. I've made the change.

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Problem 49778. Determine whether a number is a prime self number

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Problem 49778. Determine whether a number is a prime self number

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Last 200 Solutions

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Problem Recent Solvers17

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