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

Created by ChrisR

Solve Later

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. 

Solve

Solution Stats

33 Solutions
15 Solvers

Last Solution submitted on Sep 11, 2024

Last 200 Solutions

Problem Comments

2 Comments

2 Comments

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.

Solution Comments

Show comments

Problem Recent Solvers15

Problem Tags

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

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

Solution Stats

Last 200 Solutions

Problem Comments

Solution Comments

Problem Recent Solvers15

Suggested Problems

More from this Author284

Problem Tags

Community Treasure Hunt

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

Solution Stats

Last 200 Solutions

Problem Comments

Solution Comments

Problem Recent Solvers15

Suggested Problems

More from this Author284

Problem Tags

Community Treasure Hunt

Players