The hypotenuse of a primitive Pythagorean triangle in which the hypotenuse and a leg are palindromes.
5, 101, 353, 373, 545, 757, 797, 10001, 10301, 12421, 14741, 39293, 52025, 52225, 58885, 79897, 94349, 1000001, 1044401, 1220221, 1242421, 3155513, 3157513, 3559553, 3575753, 3755573, 3779773, 5200025, 5678765, 7175717, 7393937, 9818189, 100000001, 100030001
1
The hypotenuse of the triples in S000503. Note that we show each hypotenuse only once, even though it may occur more than once. Note that there are no terms having an even number of digits.
T. D. Noe, Plot of 56 terms
T. D. Noe, Table of 56 terms
John Rafael M. Antalan and Richard P. Tagle, Numeric palindromes in primitive and non-primitive Pythagorean triples, arxiv.org 1502.06760 (Feb 24 2015)
Eric W. Weisstein, MathWorld: Pythagorean Triple
Cf. S000501-S000509, S000579, S000580.
nonn,base,hard
T. D. Noe, Feb 25 2015