A new sequence

devarajkandadai · 2007-08-25, 12:14

A 132469 (OEIS) is a new sequence.
A.K.Devaraj

Jens K Andersen · 2007-08-25, 15:23

A132469(n) = (2^(5n)-1)/31 = (32^n-1)/31 = base 32 generalized repunits.

sweety439 · 2020-12-01, 21:23

Quote:

Originally Posted by Jens K Andersen

A132469(n) = (2^(5n)-1)/31 = (32^n-1)/31 = base 32 generalized repunits.

There are no primes in this sequence, since 32^n-1 = (2^n-1) * (16^n+8^n+4^n+2^n+1), and since the two factors are both >31 for n>5 ((32^n-1)/31 is not prime for all 1<=n<=5), thus the factorization is not trivial.

VBCurtis · 2020-12-01, 22:08

You're only 13 years late, and not even on-topic.

https://en.wikipedia.org/wiki/Intern...m#Necroposting

2007-08-25, 12:14	#1
devarajkandadai May 2004 2²·79 Posts	A new sequence A 132469 (OEIS) is a new sequence. A.K.Devaraj

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2007-08-25, 15:23	#2
Jens K Andersen Feb 2006 Denmark 2×5×23 Posts	A132469(n) = (2^(5n)-1)/31 = (32^n-1)/31 = base 32 generalized repunits.

2020-12-01, 22:08	#4
VBCurtis "Curtis" Feb 2005 Riverside, CA 2³·5·11·13 Posts	You're only 13 years late, and not even on-topic. https://en.wikipedia.org/wiki/Intern...m#Necroposting