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A078262 Sum of the forward and reverse concatenations of 1 to n. 1
2, 33, 444, 5555, 66666, 777777, 8888888, 99999999, 1111111110, 23333333231, 2345555545332, 244567776755433, 25466789897765534, 2647689001998775635, 274869910212099785736, 28497092031222200795837, 2950719304132232301805938 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Harvey P. Dale, Table of n, a(n) for n = 1..369

EXAMPLE

a(3) = 123 +321 = 444,a(10) = 12345678910 + 10987654321 = 23333333231.

MATHEMATICA

Table[With[{c1=FromDigits[Flatten[IntegerDigits/@Range[n]]], c2= FromDigits[ Flatten[ IntegerDigits/@Range[n, 1, -1]]]}, c1+c2], {n, 20}] (* Harvey P. Dale, Jul 03 2020 *)

CROSSREFS

Cf. A078263.

Sequence in context: A100023 A336969 A119300 * A118117 A231794 A083143

Adjacent sequences:  A078259 A078260 A078261 * A078263 A078264 A078265

KEYWORD

base,nonn

AUTHOR

Amarnath Murthy, Nov 24 2002

EXTENSIONS

More terms from Sascha Kurz, Jan 04 2003

STATUS

approved

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Last modified March 1 03:32 EST 2021. Contains 341732 sequences. (Running on oeis4.)