The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Please make a donation to keep the OEIS running. We are now in our 56th year. In the past year we added 10000 new sequences and reached almost 9000 citations (which often say "discovered thanks to the OEIS"). Other ways to donate

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A281533 Numbers such that A279967(n) = 0. 3
 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 (list; graph; refs; listen; history; text; internal format)
 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 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

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified November 29 14:23 EST 2020. Contains 338769 sequences. (Running on oeis4.)