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A026417 a(n) = least positive integer > a(n-1) and not a(i)*a(j) for 1<=i<j<=n. 4
1, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 14, 16, 17, 19, 22, 23, 25, 26, 29, 31, 34, 37, 38, 41, 43, 46, 47, 49, 53, 58, 59, 61, 62, 67, 71, 73, 74, 79, 81, 82, 83, 86, 89, 94, 97, 101, 103, 105, 106, 107, 108, 109, 113, 118, 120, 121, 122, 127 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Ivan Neretin, Table of n, a(n) for n = 1..1000

MATHEMATICA

a = {1, 3}; used = {a[[1]]*a[[2]]}; Do[k = a[[-1]] + 1; While[MemberQ[used, k], k++]; used = Union[used, k*a]; AppendTo[a, k], {n, 3, 60}]; a (* Ivan Neretin, Mar 07 2016 *)

CROSSREFS

Cf. A026416 and references therein.

Sequence in context: A304814 A052404 A298112 * A026421 A026481 A338477

Adjacent sequences:  A026414 A026415 A026416 * A026418 A026419 A026420

KEYWORD

nonn

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified June 20 18:42 EDT 2021. Contains 345199 sequences. (Running on oeis4.)