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!)
A060401 a(n) = minimal m such that m>n, n divides m, n-1 divides m-1, n-2 divides m-2 and so on down to 1 divides m-n+1. 6

%I #16 Jul 19 2016 18:52:06

%S 2,4,9,16,65,66,427,848,2529,2530,27731,27732,360373,360374,360375,

%T 720736,12252257,12252258,232792579,232792580,232792581,232792582,

%U 5354228903,5354228904,26771144425,26771144426,80313433227,80313433228,2329089562829,2329089562830

%N a(n) = minimal m such that m>n, n divides m, n-1 divides m-1, n-2 divides m-2 and so on down to 1 divides m-n+1.

%C A099427(a(n)) = n + 1. - _Reinhard Zumkeller_, Jul 02 2011

%H Robert Israel, <a href="/A060401/b060401.txt">Table of n, a(n) for n = 1..2296</a>

%F a(n) = n + lcm(seq(i, i=1..n)).

%F a(n) = n + A003418(n). - _Robert Israel_, Jul 19 2016

%e a(5) = 65 because 5|65, 4|64, 3|63, 2|62, 1|61 and 65 is minimal.

%p seq(n+ilcm($1..n),n=1..100); # _Robert Israel_, Jul 19 2016

%Y Rightmost diagonal of triangle in A075059. Cf. A075061, A075062.

%Y Cf. A003418.

%K nonn

%O 1,1

%A Christopher Burrows (cburrows(AT)math.upenn.edu), Apr 04 2001

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 April 24 06:13 EDT 2024. Contains 371918 sequences. (Running on oeis4.)