The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A270834

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Showing entries 1-10 | older changes

A270834

Numbers n such that A256832(n)/A000129(n-1) is not divisible by n.
(history; published version)

#26 by Charles R Greathouse IV at Fri May 06 00:18:19 EDT 2016

STATUS

editing

approved

#25 by Charles R Greathouse IV at Fri May 06 00:18:15 EDT 2016

COMMENTS

No composites below 2*10^7. - Charles R Greathouse IV, May 06 2016

KEYWORD

nonn,changed

STATUS

approved

editing

#24 by Charles R Greathouse IV at Wed Apr 20 23:50:56 EDT 2016

STATUS

editing

approved

#23 by Charles R Greathouse IV at Wed Apr 20 23:50:53 EDT 2016

COMMENTS

No composites below 10^7. - Charles R Greathouse IV, Apr 20 2016

STATUS

approved

editing

#22 by Charles R Greathouse IV at Sat Mar 26 11:50:54 EDT 2016

STATUS

editing

approved

#21 by Charles R Greathouse IV at Sat Mar 26 11:50:47 EDT 2016

COMMENTS

It appears that 9 is the only composite number in this sequence generates prime numbers except 9.

#20 by Charles R Greathouse IV at Sat Mar 26 11:49:23 EDT 2016

NAME

Integers Numbers n such that (A256832(n)/A000129(n-1)) is not divisible by n.

#19 by Charles R Greathouse IV at Sat Mar 26 11:35:40 EDT 2016

OFFSET

2,1,1

LINKS

Charles R Greathouse IV, <a href="/A270834/b270834.txt">Table of n, a(n) for n = 1..10000</a>

#18 by Charles R Greathouse IV at Thu Mar 24 22:09:58 EDT 2016

PROG

(PARI) is(n)=my(a, b=Mod(1, n), t=b); for(k=2, n-2, [a, b]=[b, a+2*b]; t*=b; if(t==0, return(0))); t*(2*a+5*b) && n>2 \\ Charles R Greathouse IV, Mar 24 2016

STATUS

proposed

editing

#17 by Michael De Vlieger at Thu Mar 24 11:02:28 EDT 2016

STATUS

editing

proposed