The OEIS mourns the passing of Jim Simons and is grateful to the Simons Foundation for its support of research in many branches of science, including the OEIS.
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!)
A130700 a(0)=1; a(n) is the n-th integer from among those positive integers which are coprime to (a(n-1)*n). 0
1, 1, 3, 4, 7, 6, 17, 8, 15, 16, 23, 12, 35, 19, 33, 31, 33, 29, 55, 27, 73, 37, 49, 27, 71, 31, 57, 43, 67, 30, 109, 32, 63, 64, 71, 51, 113, 38, 79, 62, 103, 42, 145, 56, 111, 88, 105, 106, 145, 73, 127 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,3
LINKS
EXAMPLE
a(8)*9 = 135. Those positive integers which are coprime to 135 form the sequence: 1,2,4,7,8,11,13,14,16,17,19,22,... The 9th of these integers is 16, so a(9) = 16.
MAPLE
a[0]:=1: for n to 50 do CP:={}: for j while nops(CP)<=n do if gcd(n*a[n-1], j) =1 then CP:=`union`(CP, {j}) else end if end do: a[n]:=CP[n] end do: seq(a[n], n=0..50); # Emeric Deutsch, Aug 28 2007
CROSSREFS
Cf. A069213.
Sequence in context: A244974 A077580 A069213 * A117134 A334127 A095001
KEYWORD
nonn
AUTHOR
Leroy Quet, Aug 12 2007
EXTENSIONS
More terms from Emeric Deutsch, Aug 28 2007
STATUS
approved

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 June 16 15:04 EDT 2024. Contains 373430 sequences. (Running on oeis4.)