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Palindromes k such that the sum of the first palindromes up to k is a palindrome.
2

%I #15 Aug 11 2024 14:41:31

%S 1,2,3,33,77,383,21512

%N Palindromes k such that the sum of the first palindromes up to k is a palindrome.

%H P. De Geest, <a href="https://www.worldofnumbers.com/index.html">World!Of Numbers</a>

%F a(n) = A002113(1+A046486(n)). - _R. J. Mathar_, Sep 09 2015

%e a(n)=77 so 1+2+3+4+5+6+7+8+9+11+22+33+44+55+66+77 = 353.

%Y Cf. A002113, A046486, A046488.

%K nonn,hard,base

%O 1,2

%A _Patrick De Geest_, Sep 15 1998

%E Offset changed to 1 by _R. J. Mathar_, Sep 09 2015