OFFSET
1,2
COMMENTS
Also: Palindromes that are the sum of consecutive initial even composites. Sequence 4 + 6 + 8 + 10 + 12 + 14 + ... + z = n. For values of z see A058851. (Comment added by author 12/2000).
9*10^(2n)-3*10^n-2 for n >= 0 are terms. For n > 1, the first (and last digit) of a(n) is either 4 or 8. - Chai Wah Wu, Feb 20 2021
LINKS
Chai Wah Wu, Table of n, a(n) for n = 1..40
P. De Geest, Palindromic Quasipronics
P. De Geest, Palindromic Sums 2
PROG
(Python)
n, m, A028554_list = 4, 0, []
while n < 10**12:
s = str(m)
if s == s[::-1]:
A028554_list.append(m)
m += n
n += 2 # Chai Wah Wu, Feb 20 2021
CROSSREFS
KEYWORD
nonn,base
AUTHOR
EXTENSIONS
More terms from Chai Wah Wu, Feb 20 2021
STATUS
approved