A046485 -id:A046485 - cp's OEIS frontend

A046489 Sum of the first n palindromes (A002113).

1, 3, 6, 10, 15, 21, 28, 36, 45, 56, 78, 111, 155, 210, 276, 353, 441, 540, 641, 752, 873, 1004, 1145, 1296, 1457, 1628, 1809, 2000, 2202, 2414, 2636, 2868, 3110, 3362, 3624, 3896, 4178, 4470, 4773, 5086, 5409, 5742, 6085, 6438, 6801, 7174, 7557, 7950, 8354

Offset: 0

Patrick De Geest, Sep 15 1998

Harvey P. Dale, Table of n, a(n) for n = 0..1000
P. De Geest, World!Of Numbers

Cf. A002113, A007504, A046485.

palQ[n_] := Reverse[x = IntegerDigits[n]] == x; Accumulate[Select[Range[410], palQ]] (* Jayanta Basu, Jun 26 2013 *)

A176721 Partial sums of A047076.

Original entry on oeis.org

2, 30205, 133050536, 1713435083707, 12173043638400828, 151229306063970112979, 1815272942608097141328160, 16183327444272811414262846321, 331634334544577293143126414662454

Offset: 1

Jonathan Vos Post, Apr 25 2010

Partial sums of a(n+1) is the smallest palindromic prime containing exactly 2 more digits on each end than the previous term, with a(n) as a central substring. Can this partial sum ever be a palindromic prime?

			a(8) = 2 + 30203 + 133020331 + 1713302033171 + 12171330203317121 + 151217133020331712151 + 1815121713302033171215181 + 16181512171330203317121518161 = 16183327444272811414262846321 is prime

Cf. A047076, A046485.

a(n) = SUM[i=1..n] A047076(i).

cp's OEIS Frontend

A046489 Sum of the first n palindromes (A002113).

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A176721 Partial sums of A047076.

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