OFFSET
1,2
LINKS
Donovan Johnson, Table of n, a(n) for n = 1..100
FORMULA
EXAMPLE
a(4) = 5 because the 5 numbers x such that sigma(x) = A145899(4) = 72 are x = 30, 46, 51, 55, 71.
MATHEMATICA
t = DivisorSigma[1, Range[10^6]]; t2 = Sort[Tally[t]]; mn = 0; t3 = {}; Do[If[t2[[n]][[2]] > mn, mn = t2[[n]][[2]]; AppendTo[t3, t2[[n]][[2]]]], {n, Length[t2]}]; t3 (* T. D. Noe, Feb 03 2012 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Jaroslav Krizek, Feb 03 2012
EXTENSIONS
Extended to 1376 by T. D. Noe, Feb 04 2012
Terms a(41) and beyond from Donovan Johnson, Feb 04 2012
STATUS
approved