OFFSET
1,1
REFERENCES
H. E. Huntley, The Divine Proportion, A Study in Mathematical Beauty. New York: Dover, 1970. See Chapter 13, Spira Mirabilis, especially Fig. 13-5, page 173.
LINKS
Harvey P. Dale, Table of n, a(n) for n = 1..1000
Patrick De Geest, World!Of Numbers
EXAMPLE
To begin palindromic spiral, plot (1, 0), (0, 1). Hypotenuse is c^2=a^2+b^2, or 2=1+1. a(1) = 2.
a(2)=5 because c^2=a^2+b^2 and 5=1+4.
MATHEMATICA
Join[{2}, Total[#^2]&/@Partition[Select[Range[300], PalindromeQ], 2, 1]] (* Harvey P. Dale, Mar 18 2024 *)
CROSSREFS
KEYWORD
easy,nonn,base,nice
AUTHOR
STATUS
approved