login
This site is supported by donations to The OEIS Foundation.

 

Logo

"Email this user" was broken Aug 14 to 9am Aug 16. If you sent someone a message in this period, please send it again.

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A046345 Sum of the prime factors of the palindromic composite numbers (counted with multiplicity). 2
4, 5, 6, 6, 13, 14, 15, 16, 16, 18, 17, 17, 40, 22, 50, 30, 25, 103, 57, 42, 35, 24, 17, 133, 25, 52, 77, 104, 36, 43, 21, 25, 134, 105, 31, 59, 40, 44, 229, 37, 84, 26, 34, 106, 108, 20, 112, 114, 45, 118, 33, 24, 29, 106, 24, 315, 60, 38, 49, 45, 30, 23, 38, 108, 242, 78 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..66.

FORMULA

a(n) = A001414(A032350(1+n)). - R. J. Mathar, Sep 09 2015

EXAMPLE

a(60)=45 because 666 = 2 * 3 * 3 * 37 and 45 = 2 + 3 + 3 + 37.

MATHEMATICA

t={}; Do[If[!PrimeQ[n]&&Reverse[x=IntegerDigits[n]]==x, AppendTo[t, Total[Times@@@FactorInteger[n]]]], {n, 4, 740}]; t (* Jayanta Basu, Jun 04 2013 *)

CROSSREFS

Cf. A046343, A046344.

Sequence in context: A116962 A273777 A023846 * A004445 A174630 A163875

Adjacent sequences:  A046342 A046343 A046344 * A046346 A046347 A046348

KEYWORD

nonn,base

AUTHOR

Patrick De Geest, Jun 15 1998

EXTENSIONS

Offset set to 1. - R. J. Mathar, Sep 09 2015

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 | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy .

Last modified August 19 13:00 EDT 2017. Contains 290807 sequences.