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!)
A121528 a(1)=1. a(n) = n-th integer from among those positive integers which are coprime to the sum of the previous terms of this sequence. 1
1, 2, 4, 4, 5, 11, 10, 8, 16, 10, 11, 23, 29, 27, 17, 31, 18, 18, 27, 41, 21, 43, 24, 24, 32, 26, 50, 30, 29, 61, 31, 101, 41, 81, 35, 107, 37, 113, 42, 42, 41, 83, 76, 44, 67, 91, 58, 85, 97, 79, 151, 64, 61, 211, 57, 139, 57, 135, 59, 131, 103, 135, 63, 159, 65, 197, 71 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
EXAMPLE
45 = the sum of the terms a(1) to a(8), 45 = 1+2+4+4+5+11+10+8. 1,2,4,7,8,11,13,14,16,17... are the positive integers which are coprime to 45. 16 is the 9th of these integers, so a(9) = 16.
PROG
(PARI) {m=67; print1(1, ", "); s=1; for(n=2, m, k=n; c=0; while(k>0, c++; if(gcd(s, c)==1, k--)); print1(c, ", "); s=s+c)} - (Klaus Brockhaus, Aug 15 2006)
CROSSREFS
Cf. A121527.
Sequence in context: A261393 A366541 A327629 * A243003 A223227 A160904
KEYWORD
nonn
AUTHOR
Leroy Quet, Aug 05 2006
EXTENSIONS
More terms from Klaus Brockhaus, Aug 15 2006
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 July 14 05:06 EDT 2024. Contains 374291 sequences. (Running on oeis4.)