OFFSET
1,2
LINKS
Michael S. Branicky, Table of n, a(n) for n = 1..42
P. De Geest, Palindromic Quasipronics of the form n(n+x)
FORMULA
MATHEMATICA
Select[Table[k(k+9), {k, 0, 262*10^5}], PalindromeQ] (* Harvey P. Dale, Feb 13 2022 *)
PROG
(Python)
from itertools import count, islice
def ispal(n): s = str(n); return s == s[::-1]
def agen():
for k in count(0):
if ispal(k*(k+9)):
yield k*(k+9)
print(list(islice(agen(), 18))) # Michael S. Branicky, Jan 26 2022
CROSSREFS
KEYWORD
nonn,base
AUTHOR
EXTENSIONS
a(22) and beyond from Michael S. Branicky, Jan 26 2022
STATUS
approved