This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A227982 #8 Mar 31 2014 16:39:44 %S A227982 47,59,83,107,119,143,167,179,215,239,251,263,299,335,359,383,395,419, %T A227982 431,467,479,503,527,539,587,599,623,629,647,659,671,719,755,767,779, %U A227982 839,863,887,899,923,935,959,983,1007,1019,1055,1079,1091,1103,1139,1175 %N A227982 Numbers n such that sigma(n+1) - sigma(n-1) > sigma(n); where sigma(n) = A000203(n) = sum of the divisors of n. %C A227982 See A076530 - numbers n such that sigma(n+1) - sigma(n-1) = sigma(n). %C A227982 Complement of union of A076530, A227983 and number 1. %H A227982 Jaroslav Krizek, <a href="/A227982/b227982.txt">Table of n, a(n) for n = 1..2000</a> %e A227982 Number 59 is in the sequence because sigma(60) - sigma(58) = 168 - 90 = 78 > sigma(59) = 60. %t A227982 Flatten[Position[Partition[DivisorSigma[1,Range[1200]],3,1],_?(Last[#]- First[#]> #[[2]]&),{1},Heads->False]]+1 (* _Harvey P. Dale_, Mar 31 2014 *) %Y A227982 Cf. A076530, A000203, A227983. %K A227982 nonn %O A227982 1,1 %A A227982 _Jaroslav Krizek_, Aug 08 2013