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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A167348 Let a(n) be the n-th term of the sequence. Let m = primorial(a(n)); m is the minimum positive integer such that m/phi(m) >= n. 1
 2, 2, 3, 7, 13, 23, 43, 79, 149, 257, 461, 821, 1451, 2549, 4483, 7879, 13859, 24247, 42683, 75037, 131707, 230773, 405401, 710569, 1246379, 2185021, 3831913, 6720059, 11781551, 20657677, 36221753, 63503639, 111333529, 195199289 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS A variant of A091440, which is the main entry for this sequence. LINKS Table of n, a(n) for n=1..34. EXAMPLE primorial(7) = 210; 210/phi(210) = 210/48 >= 4; PROG (PARI) al(lim) = local(mm, n, m); mm=3; n=2; m=1; forprime(x=3, lim, n*=x; m*= (x-1); if (n\m >= mm, print1(x", "); mm++)); /* This will generate all terms of this sequence from the 3rd onward, up to lim. The computation slows down for large values because of the size of the internal values. */ CROSSREFS Cf. A091440. Sequence in context: A100683 A153940 A049905 * A068524 A184841 A109277 Adjacent sequences: A167345 A167346 A167347 * A167349 A167350 A167351 KEYWORD nonn AUTHOR Fred Schneider, Aug 13 2009 EXTENSIONS Edited and extended by Franklin T. Adams-Watters and N. J. A. Sloane, Aug 29 2009 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.

Last modified August 3 05:44 EDT 2024. Contains 374875 sequences. (Running on oeis4.)