Community Profile # Jean-Marie Sainthillier

### Skinexigence

Last seen: 2 days ago Active since 2012

Spoken Languages:
English, French

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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...

6 days ago

Solved

Consecutive Prime Numbers

6 days ago

Solved

Concatenated Consecutive Prime

10 days ago

Solved

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...

11 days ago

Solved

List the good primes

13 days ago

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List Proth primes

17 days 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. ...

17 days ago

Solved

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 ...

17 days 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. ...

3 months ago

Solved

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...

3 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 ...

3 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.

3 months ago

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Play Outside In with primes

3 months ago

Solved

Identify prime words

3 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...

3 months ago

Solved

List the dihedral primes

3 months ago

Solved

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...

3 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. ...

3 months ago

Solved

Play PRIMEGAME

3 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...

3 months ago