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 A069549 Smallest composite k such that phi(k) > k*(1-1/n). 2
 4, 4, 9, 25, 25, 49, 49, 121, 121, 121, 121, 169, 169, 289, 289, 289, 289, 361, 361, 529, 529, 529, 529, 841, 841, 841, 841, 841, 841, 961, 961, 1369, 1369, 1369, 1369, 1369, 1369, 1681, 1681, 1681, 1681, 1849, 1849, 2209, 2209, 2209, 2209, 2809, 2809, 2809 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Or, least composite k such that k is coprime to the n-1 numbers k+1 ... k+n-1. E.g. a(4) = 25 because 25 is coprime to 26, 27 and 28. - Amarnath Murthy, Apr 20 2004 LINKS Table of n, a(n) for n=1..50. FORMULA a(n)=nextprime(n)^2=A007918(n)^2 CROSSREFS Cf. A052349. Sequence in context: A192030 A117879 A334009 * A118069 A089539 A324010 Adjacent sequences: A069546 A069547 A069548 * A069550 A069551 A069552 KEYWORD easy,nonn AUTHOR Benoit Cloitre, Apr 21 2002 EXTENSIONS Edited by David Wasserman, Apr 23 2007 STATUS approved

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Last modified May 19 11:36 EDT 2024. Contains 372683 sequences. (Running on oeis4.)