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A026454 a(n) = least positive integer > a(n-1) and not equal to a(i)*a(j)-2 for 1<=i<j<=n. 2
1, 3, 4, 5, 6, 7, 8, 9, 11, 12, 14, 15, 17, 20, 21, 23, 24, 27, 29, 32, 35, 36, 37, 39, 41, 44, 45, 47, 48, 50, 51, 55, 56, 57, 59, 60, 62, 63, 65, 69, 71, 72, 74, 76, 77, 80, 81, 84, 87, 89, 91, 92, 93, 95, 99, 101, 102, 104, 105, 107 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
MATHEMATICA
a = {1, 3}; used = {a[[1]]*a[[2]] - 2}; Do[k = a[[-1]] + 1; While[MemberQ[used, k], k++]; used = Union[used, k*a - 2]; AppendTo[a, k], {n, 3, 60}]; a (* Ivan Neretin, Mar 06 2016 *)
CROSSREFS
Cf. A026453 and references therein.
Sequence in context: A039181 A298111 A299534 * A026458 A059109 A189080
KEYWORD
nonn
AUTHOR
EXTENSIONS
Definition corrected by Harvey P. Dale, Jun 12 2013
STATUS
approved

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Last modified June 21 02:34 EDT 2024. Contains 373535 sequences. (Running on oeis4.)