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A088001 a(n) is the sum of non-palindromic divisors of n. 3
0, 0, 0, 0, 0, 0, 0, 0, 0, 10, 0, 12, 13, 14, 15, 16, 17, 18, 19, 30, 21, 0, 23, 36, 25, 39, 27, 42, 29, 55, 31, 48, 0, 51, 35, 66, 37, 57, 52, 70, 41, 77, 43, 0, 60, 69, 47, 100, 49, 85, 68, 91, 53, 99, 0, 98, 76, 87, 59, 147, 61, 93, 84, 112, 78, 0, 67, 119, 92, 129, 71, 162, 73 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,10

LINKS

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

FORMULA

a(n)=0 iff all divisors are palindromic. See A062687.

a(n)+A088000(n) = A000203(n). - R. J. Mathar, Sep 09 2015

MAPLE

A088001 := proc(n)

numtheory[sigma](n)-A088000(n) ;

end proc; # R. J. Mathar, Jul 28 2016

MATHEMATICA

Table[Plus @@ Select[Divisors[k], Reverse[x = IntegerDigits[#]] != x &], {k, 73}] (* Jayanta Basu, Aug 12 2013 *)

PROG

(Python)

def ispal(n):

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

def A088001(n):

s=0

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

if n%i==0 and not ispal(i):

s+=i

return s # Indranil Ghosh, Feb 10 2017

CROSSREFS

Cf. A087999, A088000, A088002.

Sequence in context: A341504 A196081 A320380 * A344071 A260946 A019091

Adjacent sequences: A087998 A087999 A088000 * A088002 A088003 A088004

KEYWORD

base,nonn

AUTHOR

Labos Elemer, Oct 14 2003

STATUS

approved

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Last modified January 29 16:07 EST 2023. Contains 359923 sequences. (Running on oeis4.)