OFFSET
1,3
COMMENTS
a(50) > 70710678118654752440. - Patrick De Geest, May 25 2021
LINKS
Patrick De Geest, Table of n, a(n) for n = 1..49 (terms a(1)..a(29) from Giovanni Resta)
Patrick De Geest, Palindromic Sums of Squares of Consecutive Integers
Patrick De Geest, Palindromic Centered Polygonal Numbers
PROG
(PARI) isok(m) = my(d=digits(m^2+(m+1)^2)); d == Vecrev(d); \\ Michel Marcus, Jan 05 2019
CROSSREFS
KEYWORD
nonn,base
AUTHOR
EXTENSIONS
a(18)-a(21) from Donovan Johnson, Aug 26 2012
a(22)-a(29) from Giovanni Resta, Aug 06 2019
a(1)=0 added by Patrick De Geest, May 25 2021
STATUS
approved