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 A072099 First term = 1 and, for each n > 1, n*a(n) does not appear. 2
 1, 2, 3, 5, 6, 7, 8, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 21, 22, 23, 24, 25, 26, 27, 28, 29, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Does lim_{n->infinity} (a(n)-n)/sqrt(n) = 1? LINKS Ivan Neretin, Table of n, a(n) for n = 1..10000 EXAMPLE a(2) = 2 so 2*2 = 4 is not in the sequence. a(4) = 5 so 4*5 = 20 is not in the sequence. There is no n such that n*a(n) = 3, so 3 is in the sequence. MATHEMATICA Nest[Append[#, Min@Complement[Range[#[[-1]]*Length@# + 1], #, #*Range@Length@#]] &, {1}, 70] (* Ivan Neretin, Dec 20 2017 *) CROSSREFS For complement see A297190. Sequence in context: A213367 A175084 A171519 * A046841 A244218 A164514 Adjacent sequences:  A072096 A072097 A072098 * A072100 A072101 A072102 KEYWORD easy,nonn AUTHOR Benoit Cloitre, Jun 18 2002 EXTENSIONS Name changed by Franklin T. Adams-Watters, Aug 21 2013 STATUS approved

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Last modified September 20 06:58 EDT 2018. Contains 315226 sequences. (Running on oeis4.)