A378729 Characteristic function of the primitive practical numbers as a subsequence of the practical numbers.

1, 1, 0, 1, 0, 0, 0, 0, 1, 0, 1, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 1, 0, 1, 0, 0, 0, 0, 1, 0, 0, 1, 1, 0, 0, 0, 0, 1, 1, 1, 0, 0, 0, 1, 0, 1, 1, 1, 0, 0, 1, 1, 0, 1, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 1, 0, 0, 1

Offset: 1

Author

Frank M Jackson, Dec 06 2024

Keywords

• nonn

Comments

a(n) = 1 indicates that the practical number A005153(n) is also primitive.

Examples

			a(9) = 1 because A005153(9) = 20 and 20 is primitive practical.
		

Crossrefs

Cf. A005153, A267124.

Programs

Mathematica

plst=Last/@ReadList["https://oeis.org/A005153/b005153.txt", {Number, Number}]; pplst=Last/@ReadList["https://oeis.org/A267124/b267124.txt", {Number, Number}]; getpplst[n_] := Module[{}, Select[pplst, # <= n &]]; Table[lst=getpplst[plst[[n]]]; If[MemberQ[lst, plst[[n]]], 1, 0], {n, 1, 200}]