login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A178088 Let Sn=p1+....+pn and zn=Sn/pn. (zn) is not increasing; we have z1<z2<...<z30 then zn<zn-1 for the first time for p31=127, the second time for p35=149 and so on... 0

%I #6 Jul 19 2013 12:28:45

%S 127,149,211,223,307,331,479,521,541,787,853,877,907,967,1087,1151,

%T 1277,1361,1399,1597,1657,1693,1777,1847,1931,1949,1973,2129,2179,

%U 2203,2237,2267,2333,2503,2521,2579,2609,2819,2879,2999

%N Let Sn=p1+....+pn and zn=Sn/pn. (zn) is not increasing; we have z1<z2<...<z30 then zn<zn-1 for the first time for p31=127, the second time for p35=149 and so on...

%o (PARI) lista(nn) = {z = 1; for (n=1, nn, nz = sum(i=1, n, prime(i))/prime(n); if (nz < z, print1(prime(n), ", ")); z = nz;);} \\ _Michel Marcus_, Jul 19 2013

%K nonn

%O 1,1

%A Alain Marot (marot.alain(AT)orange.fr), May 19 2010

%E 20th term is 1597 instead of 1587 by Marot Alain (marot.alain(AT)orange.fr), Jun 05 2010

%E More terms from _Michel Marcus_, Jul 19 2013

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified March 28 05:39 EDT 2024. Contains 371235 sequences. (Running on oeis4.)