OFFSET
1,1
COMMENTS
Wells erroneously writes that this sequence begins as 50, 65, 85, 145, ... . - Stefano Spezia, Sep 07 2024
REFERENCES
David Wells, The Penguin Dictionary of Curious and Interesting Numbers. Penguin Books, NY, 1986, Revised edition 1987. See p. 125.
LINKS
Robert Price, Table of n, a(n) for n = 1..16794
FORMULA
n such that A000161(n) = 2.
EXAMPLE
a(3) = 65 because 65 = 8^2 + 1^2 = 7^2 + 4^2;
a(4) = 85 because 85 = 9^2 + 2^2 = 7^2 + 6^2.
MATHEMATICA
Select[Range[730], Length[PowersRepresentations[#, 2, 2]]==2 &] (* Stefano Spezia, Sep 07 2024 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Hugo Pfoertner, Jul 09 2003
STATUS
approved