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A088000 a(n) is the sum of palindromic divisors of n. 7
1, 3, 4, 7, 6, 12, 8, 15, 13, 8, 12, 16, 1, 10, 9, 15, 1, 21, 1, 12, 11, 36, 1, 24, 6, 3, 13, 14, 1, 17, 1, 15, 48, 3, 13, 25, 1, 3, 4, 20, 1, 19, 1, 84, 18, 3, 1, 24, 8, 8, 4, 7, 1, 21, 72, 22, 4, 3, 1, 21, 1, 3, 20, 15, 6, 144, 1, 7, 4, 15, 1, 33, 1, 3, 9, 7, 96, 12, 1, 20, 13, 3, 1, 23, 6, 3 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Indranil Ghosh, Table of n, a(n) for n = 1..10000

EXAMPLE

n=14: a(14)=1+2+7=10;

n=101: a(101)=1+101=102;

MAPLE

A088000 := proc(n)

    a := 0 ;

    for d in numtheory[divisors](n) do

        if isA002113(d) then

            a := a+d ;

        end if;

    end do;

    a ;

end proc:

seq(A088000(n), n=1..100) ; # R. J. Mathar, Sep 09 2015

MATHEMATICA

Table[Plus @@ Select[Divisors[k], Reverse[x = IntegerDigits[#]] == x &], {k, 86}] (* Jayanta Basu, Aug 12 2013 *)

PROG

(Python)

def ispal(n):

....if n==int(str(n)[::-1]):return True

....return False

def A088000(n):

....s=0

....for i in range(1, n+1):

........if n%i==0 and ispal(i)==True:

............s+=i

....return s # Indranil Ghosh, Feb 10 2017

CROSSREFS

Sequence in context: A116607 A107749 A093811 * A284344 A168338 A034690

Adjacent sequences:  A087997 A087998 A087999 * A088001 A088002 A088003

KEYWORD

base,nonn

AUTHOR

Labos Elemer, Oct 14 2003

STATUS

approved

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Last modified December 16 09:06 EST 2019. Contains 330020 sequences. (Running on oeis4.)