OFFSET
1,1
LINKS
G. C. Greubel, Table of n, a(n) for n = 1..10000
MAPLE
with(numtheory): seq(`if`(sigma(i+2)-sigma(i+1)>(sigma(i+1)-sigma(i)), i, print( )), i=1..142);
MATHEMATICA
Select[Range[150], DivisorSigma[1, #+2] - DivisorSigma[1, #+1] > (DivisorSigma[1, # + 1] - DivisorSigma[1, #]) &] (* G. C. Greubel, Sep 03 2018 *)
Position[Differences[#, 2]&/@Partition[DivisorSigma[1, Range[140]], 3, 1], _?(Positive[ #]&)][[All, 1]] (* Harvey P. Dale, Jan 18 2023 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Asher Auel, Jan 10 2000
STATUS
approved