A046486 Numbers k such that the sum of the first k palindromes is a palindrome.
1, 2, 3, 12, 16, 47, 314
Offset: 1
Examples
a(n)=47 so 1+2+3+...+373+383 (47 terms) = 7557.
Links
- Patrick De Geest, World!Of Numbers
Programs
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Mathematica
palQ[n_] := Reverse[x = IntegerDigits[n]] == x; t = Select[Range[25000], palQ[#] &]; Flatten[Rest[Position[Accumulate[t], ?palQ]]] (* _Jayanta Basu, Jun 26 2013 *) Position[Accumulate[Select[Range[100000],PalindromeQ]],?PalindromeQ] // Flatten (* Requires Mathematica version 10 or later *) (* _Harvey P. Dale, Jan 31 2020 *)
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