A087672 n = k^2 - (reversal of k)^2 for two different values of k.

891, 1485, 1584, 2376, 3168, 4455, 4752, 89991, 95931, 101871, 107811, 149985, 155925, 159984, 161865, 167805, 167904, 175824, 183744, 191664, 239976, 247896, 255816, 263736, 271656, 319968, 327888, 335808, 343728, 351648, 449955, 479655

Offset: 0

Author

Paul Lusch, Sep 26 2003

Keywords

• nonn

Comments

Each n is a multiple of 99. The first few pairs for k: (30,54) (41,87) (40,53) (51,75) (62,97) (72,96) (71,84) (300,504) (310,534) (320,564) (330,594) (401,807) (411,837) (400,503) (421,867) (431,897) (410,523) (420,543) (430,563) (440,583).

Examples

			2376 = 51^2 - 15^2 = 75^2 - 57^2; 161865 = 421^2 - 124^2 = 867^2 - 768^2