The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A332850 Numbers k = a^2 + b^2 such that reversal(k) = a^2 - b^2 for a > b > 0, where reversal is A004086. 0
 699796, 4854634, 6752626, 84036010, 931910661, 21584860960, 52554850525, 467170024564, 637843128736, 638730439636, 638734039636, 638943127636, 727830438745, 727834038745, 746710459825, 746754019825, 748943127625, 9894192267061 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS When b=0, the palindromic numbers m = a^2 + b^2 such that reversal(m) = a^2 - b^2, are A002779 (palindromic squares). a(19) > 3*10^14, if it exists. - Giovanni Resta, Feb 27 2020 LINKS EXAMPLE 699796 = 836^2 + 30^2 and 697996 = 836^2 - 30^2. MATHEMATICA Do[If[IntegerReverse[a^2+b^2]==a^2-b^2, Print[{a^2+b^2, a, b}]], {a, 1, 50000}, {b, 1, a-1}] PROG (PARI) isok(k) = {my(r = fromdigits(Vecrev(digits(k))), s = r+k, d = r-k); if (d && !(s % 2) && issquare(s/2) && !(d % 2) && issquare(d/2), 1, 0); } \\ Michel Marcus, Feb 27 2020 CROSSREFS Cf. A002779, A004086, A055096, A035519, A202386. Sequence in context: A027829 A258129 A204496 * A183835 A273969 A203834 Adjacent sequences:  A332847 A332848 A332849 * A332851 A332852 A332853 KEYWORD nonn,base,more AUTHOR Metin Sariyar, Feb 26 2020 EXTENSIONS a(6)-a(18) from Giovanni Resta, Feb 27 2020 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified August 19 15:40 EDT 2022. Contains 356229 sequences. (Running on oeis4.)