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A180436 Palindromic numbers which are sum of consecutive squares. 3
1, 4, 5, 9, 55, 77, 121, 181, 313, 434, 484, 505, 545, 595, 636, 676, 818, 1001, 1111, 1441, 1771, 4334, 6446, 10201, 12321, 14641, 17371, 17871, 19691, 21712, 40804, 41214, 42924, 44444, 44944, 46564, 51015, 65756, 69696, 81818, 94249, 97679, 99199 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

In more than one way: 554455, 9343439, ... - Robert G. Wilson v, May 28 2012

LINKS

Robert G. Wilson v, Table of n, a(n) for n = 1..411

EXAMPLE

1001 is in the sequence because 1001 is palindromic and it can be written as sum of consecutive squares (1001 = 4^2 + 5^2 + 6^2 + ... + 13^2 + 14^2).

MATHEMATICA

palQ[n_Integer] := Block[{idn = IntegerDigits[n]}, idn == Reverse[idn]]; lst = {}; k = 1; While[k < 1000, AppendTo[lst, Select[ Accumulate[ Range[k, 1000]^2], palQ]]; lst = Union@ Flatten@ lst; k++]; Select[lst, # < 10^6 &] (* Robert G. Wilson v, May 28 2012 *)

CROSSREFS

Cf. A002113, A002779, A034705.

Sequence in context: A041151 A279919 A041467 * A121919 A041627 A132811

Adjacent sequences:  A180433 A180434 A180435 * A180437 A180438 A180439

KEYWORD

nonn,easy,base

AUTHOR

Zhining Yang, Jan 19 2011

STATUS

approved

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Last modified August 20 03:34 EDT 2017. Contains 290823 sequences.