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# Jean-Marie Sainthillier

### Skinexigence

Last seen: Today Active since 2012

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Find the nth composite number.
Everyone heard about the nth prime number. Let's try to find out the nth composite. For example , 1 is the first composite, 10 i...

2 months ago

Solved

Consecutive Prime Numbers

2 months ago

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Concatenated Consecutive Prime

2 months ago

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Hoax Numbers
A Hoax Number (OEIS A019506) is defined as a composite number, whose sum of digits is equal to the sum of digits of its distinct...

2 months ago

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List the good primes

2 months ago

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List Proth primes

2 months ago

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List the nth prime quartet prefix
Prime numbers larger than 5 can end only in 1, 3, 7, or 9, but of course not all numbers ending in these four digits are prime. ...

2 months ago

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Count the primes in Collatz sequences
Several Cody problems (21, 69, 42937, 44448, 44784, 52422) involve Collatz sequences. These start with a seed . If is odd, the ...

2 months ago

Solved

Area-01
Given the radius of the circle inscribed in a square, find the area that is not bounded by the circle but inside the square. ...

4 months ago

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Create array of all Distances between two Sets of Points
This Challenge is a subsection of Martian Pranks based on Tim's efficient Distance calculation between sets of points. Given Po...

4 months ago

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Generate a matrix as follows
write a Function that gives like the following for a random n: n=2 ans= [ 0 1 1 0] n=6 ans= [ 0 ...

4 months ago

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Find the number of days in a given year
Given a year number (eg. 2000) as input, find how many days are there in the given year.

4 months ago

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Play Outside In with primes

4 months ago

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Identify prime words

4 months ago

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Determine whether a number is unprimeable
The number 204 is unprimeable because no single digit can be changed to make it prime. In contrast, the number 207 is not unprim...

4 months ago

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List the dihedral primes

4 months ago

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Ugly numbers - 02
Ugly numbers are those whose prime factors are 2, 3 or 5. find the nth ugly number. n.b. unlike the previous problem,trivi...

5 months ago

Solved

Ugly numbers - 03
For this case, a number is defined ugly if it has prime factors consisting of only elements of x. Find the nth ugly number. ...

5 months ago

Solved

Play PRIMEGAME

5 months ago

Solved

Determine whether a number is a prime self number
Integers can be classified as generated numbers or self numbers. A generated number is one that can be expressed as the sum of a...

5 months ago