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A046488 Palindromes that are the sum of the first n palindromes for some n. 3
1, 3, 6, 111, 353, 7557, 2376732 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

No additional terms up through the partial sums of all palindromes less than or equal to 10^7-1. - Harvey P. Dale, Jun 23 2018

LINKS

Table of n, a(n) for n=1..7.

P. De Geest, World!Of Numbers

FORMULA

a(n) = A046489(A046486(n)-1). - R. J. Mathar, Sep 09 2015

EXAMPLE

a(4) = 111 as 111 = 1+2+3+4+5+6+7+8+9+11+22+33.

MATHEMATICA

palQ[n_] := Reverse[x = IntegerDigits[n]] == x; Select[Accumulate[Select[Range[25000], palQ]], palQ] (* Jayanta Basu, Jun 26 2013 *)

Select[Accumulate[Select[Range[10^6], PalindromeQ]], PalindromeQ] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Jun 23 2018 *)

CROSSREFS

Cf. A002113, A046486, A046487.

Sequence in context: A101574 A082980 A157536 * A074880 A225884 A115647

Adjacent sequences:  A046485 A046486 A046487 * A046489 A046490 A046491

KEYWORD

nonn,hard,base

AUTHOR

Patrick De Geest, Sep 15 1998

EXTENSIONS

Edited by Jonathan Sondow, Nov 28 2017

STATUS

approved

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Last modified October 29 21:18 EDT 2020. Contains 338074 sequences. (Running on oeis4.)