OFFSET
1,1
LINKS
P. De Geest, Palindromic pronic numbers of the form n(n+1)
Eric Weisstein's World of Mathematics, Palindromic Number.
Eric Weisstein's World of Mathematics, Pronic Number.
EXAMPLE
272 belongs to the sequence as 272 = 16*17 is a palindrome.
MATHEMATICA
Select[2*Accumulate[Range[15820000]], IntegerDigits[#] == Reverse[ IntegerDigits[#]]&] (* Harvey P. Dale, Sep 03 2013 *)
PROG
(Python)
A028337_list, n = [], 0
for i in range(2, 10**6, 2):
....n += i
....s = str(n)
....if s == s[::-1]:
........A028337_list.append(n) # Chai Wah Wu, Jan 15 2015
CROSSREFS
KEYWORD
nonn,base
AUTHOR
EXTENSIONS
a(20)-a(23) from G. C. Greubel, Nov 04 2017
STATUS
approved