mersenneforum.org OEIS sequence A027750
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2017-04-26, 16:43   #1
MattcAnderson

"Matthew Anderson"
Dec 2010
Oregon, USA

22×149 Posts
OEIS sequence A027750

Here is my mathematical doodle for today.
I noticed that OEIS.org/A027750/
has no Maple code in it.
I know that there are not many Maple people who frequent mersenneforum.org, but maybe
someone else will follow through with this, if I don't.
The Maple code goes like this -
for a from 1 to 20 do
if isprime(a) = false then print(ifactor(a)); else print(a); end if;
end do;
This code functions, but it does not produce the same sequence as A27750.
For what its worth,
Matt
Attached Files
 A027750.pdf (79.0 KB, 52 views)

 2017-04-26, 17:18 #2 LaurV Romulan Interpreter     Jun 2011 Thailand 5×11×157 Posts you forgot to print the 1's (every number is divisible by 1) and all the composite divisors. In Pari that would be "n=100; for(i=1,n,print(divisors(i)))" or so, with a trick to avoid printing all the brackets (like adding them to a list, or so, instead of printing).
2017-04-26, 22:19   #3
science_man_88

"Forget I exist"
Jul 2009
Dumbassville

26·131 Posts

Quote:
 Originally Posted by LaurV you forgot to print the 1's (every number is divisible by 1) and all the composite divisors. In Pari that would be "n=100; for(i=1,n,print(divisors(i)))" or so, with a trick to avoid printing all the brackets (like adding them to a list, or so, instead of printing).
Code:
v=List(); for(n=1, 20, fordiv(n, d, listput(v, d))); Vec(v)
is already listed in the sequence

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