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Revision History for A115103

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Showing entries 1-10 | older changes
Primes p such that p-1 and p+1 have the same number of prime factors with multiplicity.
(history; published version)
#18 by OEIS Server at Sun May 08 17:14:11 EDT 2022
LINKS

Alois P. Heinz, <a href="/A115103/b115103_1.txt">Table of n, a(n) for n = 1..10000</a> (first 1000 terms from Vincenzo Librandi)

#17 by Alois P. Heinz at Sun May 08 17:14:11 EDT 2022
STATUS

editing

approved

Discussion
Sun May 08
17:14
OEIS Server: Installed new b-file as b115103.txt.  Old b-file is now b115103_1.txt.
#16 by Alois P. Heinz at Sun May 08 17:14:05 EDT 2022
LINKS

Vincenzo Librandi, Alois P. Heinz, <a href="/A115103/b115103_1.txt">Table of n, a(n) for n = 1..10000</a> (first 1000</a> terms from Vincenzo Librandi)

STATUS

approved

editing

#15 by Alois P. Heinz at Sun May 08 17:09:46 EDT 2022
STATUS

editing

approved

#14 by Alois P. Heinz at Sun May 08 17:09:41 EDT 2022
MAPLE

# second Maple program:

q:= p-> isprime(p) and (f-> f(p+1)=f(p-1))(numtheory[bigomega]):

select(q, [$1..3000])[]; # Alois P. Heinz, May 08 2022

STATUS

approved

editing

#13 by R. J. Mathar at Wed Feb 13 10:08:37 EST 2019
STATUS

editing

approved

#12 by R. J. Mathar at Wed Feb 13 10:08:11 EST 2019
MAPLE

isA115103 := proc(n)

if not type(n, prime) then

return false;

end if;

if numtheory[bigomega](n-1) <> numtheory[bigomega](n+1) then

false;

else

true ;

end if ;

end proc:

for n from 2 to 3000 do

if isA115103(n) then

printf("%d, ", n) ;

end if;

end do: # R. J. Mathar, Feb 13 2019

CROSSREFS

Cf. A067386 (without multiplicity), A323498, A323536, A323537.

STATUS

approved

editing

#11 by Joerg Arndt at Sun Apr 27 05:22:57 EDT 2014
STATUS

proposed

approved

#10 by Michel Marcus at Sun Apr 27 05:18:00 EDT 2014
STATUS

editing

proposed

#9 by Michel Marcus at Sun Apr 27 05:16:21 EDT 2014
CROSSREFS

Cf. A067386 (without multiplicity).

STATUS

approved

editing