A281533 Numbers such that A279967(n) = 0.

17, 23, 47, 57, 93, 107, 155, 173, 233, 255, 327, 353, 437, 467, 563, 597, 677, 705, 743, 863, 905, 1037, 1083, 1187, 1227, 1277, 1433, 1487, 1607, 1655, 1713, 1893, 1955, 2027, 2095, 2147, 2213, 2293, 2357, 2417, 2467, 2487, 2503, 2703, 2719, 2777, 2861, 2993, 3005, 3083, 3251

Offset

1,1

Comments

This sequence is neither a subset nor a superset of sequence A278436 since 155 and 817 are in one, but not the other, respectively.

Links

Table of n, a(n) for n=1..51.

Example

Number 155 = 5*31, equivalent to array position (17, 2), is in the sequence since all prior numbers in column 1 are even as are those in column 2, except 9 which is not a factor of 155.

Mathematica

(* support functions are in A279967*)
a281533[k_] := Module[{ut=upperTriangle[k], ms=Table[" ", {i, 1, k}, {j, 1, k}], h, pos, val, seqL={}}, ms[[1, 1]]=1; For[h=2, h<=Length[ut], h++, pos=ut[[h]]; val=Apply[Plus, Select[Map[ms[[Apply[Sequence, #]]]&, priorPos[pos]], #!=0 && Mod[seqPos[pos], #]==0&]]; If[val==0, AppendTo[seqL, val]]; ms[[Apply[Sequence, pos]]]=val]; seqL]
a281533[81] (* data *)

Crossrefs

Cf. A278436, A279966, A279967.

Sequence in context: A086532 A159044 A267984 * A278436 A126329 A130098

Adjacent sequences: A281530 A281531 A281532 * A281534 A281535 A281536

Keyword

nonn

Author

Hartmut F. W. Hoft, Jan 23 2017

Status

approved