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 A015914 #20 Jul 04 2021 00:30:35 %S A015914 5,7,11,13,17,23,31,37,41,47,53,61,67,73,83,97,101,103,104,107,131, %T A015914 147,151,157,167,173,191,193,223,227,233,251,257,263,271,277,307,311, %U A015914 331,347,353,367,373,383,433,443,457,461,503,541,557,563,571 %N A015914 Numbers k such that sigma(k) + 6 = sigma(k+6). %H A015914 Reinhard Zumkeller, <a href="/A015914/b015914.txt">Table of n, a(n) for n = 1..1000</a> %t A015914 Select[Range[50000], DivisorSigma[1, #] + 6==DivisorSigma[1, # + 6] &] (* _Vincenzo Librandi_, Mar 10 2014 *) %Y A015914 Cf. A000203. %Y A015914 See A054903 for nonprimes. - _Reinhard Zumkeller_, Jan 27 2009 %K A015914 nonn %O A015914 1,1 %A A015914 _Robert G. Wilson v_