The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A059118 Composite solutions to sigma(x)+8 = sigma(x+8). 3
 27, 1615, 1885, 218984, 4218475, 312016315, 746314601, 1125845307, 1132343549, 1296114929, 9016730984, 303419868239, 1197056419121, 2065971192041, 2948269852109, 4562970154601 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS a(17) > 10^13. - Giovanni Resta, Jul 11 2013 REFERENCES The first 4 terms were found by Labos Elemer, see A015915. LINKS EXAMPLE sigma(27)+8 = 48 = sigma(27+8), so 27 is in the sequence. MATHEMATICA ta={{0}}; Do[If[Equal[DivisorSigma[1, n+8] -DivisorSigma[1, n]-8, 0]&&!PrimeQ[n], Print[n]; ta=Append[ta, n]], {n, 1000000000, 1300000000}]; ta=Delete[ta, 1] (* Labos Elemer, Jan 10 2005 *) CROSSREFS Cf. A015915. Sequence in context: A073224 A294964 A184689 * A211926 A304119 A017199 Adjacent sequences:  A059115 A059116 A059117 * A059119 A059120 A059121 KEYWORD nonn,more AUTHOR Jud McCranie, Jan 06 2001 EXTENSIONS a(8)-a(10) terms from Labos Elemer, Jan 10 2005 Offset corrected and a(11) added by Donovan Johnson, Dec 07 2008 a(12)-a(16) from Giovanni Resta, Jul 11 2013 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified February 17 02:22 EST 2020. Contains 331976 sequences. (Running on oeis4.)