

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
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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



