OFFSET
1,2
COMMENTS
Is 864666666468 the only term in this sequence that has an even number of digits? - Jon E. Schoenfield, Mar 30 2015
LINKS
Bui Quang Tuan, Table of n, a(n) for n = 1..458
EXAMPLE
Palindrome 585 is in the sequence because 585 = 12^2 + 21^2.
The smallest term that can be obtained in more than one way is 125484521 = 11020^2 + 2011^2 = 11200^2 + 211^2. Are there any terms that can be obtained in more than two ways? - Jon E. Schoenfield, Mar 30 2015
MATHEMATICA
Sort@ DeleteDuplicates@ Select[Table[n^2 + FromDigits[Reverse[IntegerDigits@ n]]^2, {n, 10000}], Reverse@ IntegerDigits@ # == IntegerDigits@ # &] (* Michael De Vlieger, Mar 28 2015 *)
PROG
(PARI) rev(n)=r=""; d=digits(n); for(i=1, #d, r=concat(Str(d[i]), r)); eval(r)
v=[]; for(n=0, 10^4, if(rev(P=(n^2+rev(n)^2))==P, v=concat(v, P))); vecsort(v, , 8) \\ Derek Orr, Mar 29 2015
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Bui Quang Tuan, Mar 28 2015
EXTENSIONS
Data corrected by Derek Orr, Mar 29 2015
STATUS
approved