OFFSET
1,1
COMMENTS
Third row of A113465.
LINKS
Harvey P. Dale, Table of n, a(n) for n = 1..1000
EXAMPLE
a(7) = 8 because 8, 15 and 22 each have 4 divisors.
MATHEMATICA
snd[n_]:=Module[{k=1}, While[Length[Union[DivisorSigma[0, {k, k+n, k+2n}]]]>1, k++]; k]; Array[snd, 90] (* Harvey P. Dale, Aug 20 2017 *)
PROG
(PARI) a(n) = {k = 1; until ((numdiv(k) == numdiv(k+n)) && (numdiv(k) == numdiv(k+2*n)), k++); return (k); } \\ Michel Marcus, Jun 16 2013
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
David Wasserman, Jan 08 2006
STATUS
approved