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A093866 a(0)=1, then a(n) is the least number such that there are exactly n numbers coprime to a(n-1) between a(n-1) and a(n) (excluded). 0
1, 3, 6, 14, 24, 38, 50, 68, 84, 114, 146, 168, 210, 264, 308, 348, 398, 432, 486, 542, 582, 644, 698, 744, 818, 868, 930, 1034, 1098, 1188, 1286, 1348, 1412, 1478, 1546, 1616, 1688, 1762, 1838, 1916, 1996, 2078, 2162, 2254, 2362, 2452, 2544, 2688, 2856 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

Obviously, from a(3) onwards, all terms are even.

LINKS

Table of n, a(n) for n=0..48.

EXAMPLE

a(5) = 24, a(6) = 38, and the five numbers coprime to 24 are 25, 29, 31, 35 and 37.

MATHEMATICA

k = 1; Print[k]; Do[v = 0; m = k + 1; While[v < n, If[GCD[m, k] == 1, v++ ]; m++ ]; k = m; Print[k], {n, 1, 50}] (* Ryan Propper, Jul 25 2005 *)

CROSSREFS

Sequence in context: A075189 A291987 A200823 * A056596 A026341 A026271

Adjacent sequences:  A093863 A093864 A093865 * A093867 A093868 A093869

KEYWORD

nonn

AUTHOR

Amarnath Murthy, Apr 20 2004

EXTENSIONS

More terms from Ryan Propper, Jul 25 2005

STATUS

approved

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Last modified January 28 00:32 EST 2020. Contains 331313 sequences. (Running on oeis4.)