A162818 Strictly positive numbers n such that (42*n)/(42+n) is an integer.

7, 21, 42, 56, 84, 105, 154, 210, 252, 399, 546, 840, 1722

Offset

1,1

Links

Table of n, a(n) for n=1..13.

Mathematica

f[a_, b_]:=(a*b)/(a+b); a=42; lst={}; Do[If[f[a, n]==IntegerPart[f[a, n]], AppendTo[lst, n]], {n, 9!}]; lst
Select[Range[2000], Divisible[42 #, 42 + #] &] (* Harvey P. Dale, May 09 2012 *)

Crossrefs

Cf. A162688, A162689, A162690, A162691, A162692, A162693, A162694, A162817

Cf. A127730 - Franklin T. Adams-Watters, Aug 07 2009

Sequence in context: A125228 A024837 A205864 * A024966 A342250 A226252

Adjacent sequences: A162815 A162816 A162817 * A162819 A162820 A162821

Keyword

nonn,fini,full

Author

Vladimir Joseph Stephan Orlovsky, Jul 13 2009

Extensions

Keywords fini and full added by Franklin T. Adams-Watters, Aug 07 2009

Status

approved