This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A196677 Numbers n such that sum of the divisors of n equals the sum of the reversals of the divisors of n. Numbers with all palindrome divisors are not in the sequence. 0
 30, 42, 330, 462, 681, 772, 824, 890, 989, 2180, 3030, 4242, 4542, 4722, 8074, 9775, 17331, 23980, 33330, 35823, 36213, 43263, 46662, 47324, 55805, 62121, 62421, 65301, 65451, 66441, 66741, 68181, 68331, 68631, 68781, 69171, 71215, 71452, 73565, 74391, 74417, 74572, 74972 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Subset of A080716. LINKS EXAMPLE Divisors of 989 are 1, 23, 43, 989 and 1+23+43+989=1+32+34+989=1056. Divisors of 8074 are 1, 2, 11, 22, 367, 734, 4037, 8074 and 1+2+11+22+367+734+4037+8074=1+2+11+22+763+437+7304+4708=13248. MAPLE Rev:=proc(n) local a, i, k; i:=convert(n, base, 10); a:=0; for k from 1 to nops(i) do a:=a*10+i[k]; od; a; end: P:=proc(j) local h, m, n, ok, p, r, t; for m from 1 to j  do   p:=divisors(m); t:=0; ok:=0;   for r from 1 to nops(p) do t:=t+Rev(p[r]); if p[r]<>Rev(p[r]) then ok:=1; fi;     od;   if ok=1 and sigma(m)=t then print(m); fi; od; end: P(100000); CROSSREFS Cf. A080716 Sequence in context: A219742 A050776 A090692 * A225326 A102843 A062385 Adjacent sequences:  A196674 A196675 A196676 * A196678 A196679 A196680 KEYWORD nonn,easy,base AUTHOR Paolo P. Lava, Oct 05 2011 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
Recent Additions | More pages | Superseeker | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .

Last modified May 25 08:56 EDT 2013. Contains 225646 sequences.