

A088180


a(n) is the number of numbers m < 10^n for which there is at least one k such that k + reverse(k) = m.


1



1, 5, 19, 112, 368, 2161, 7033, 41140, 133730, 781884, 2541197, 14856466, 48283738, 282274893, 917394087, 5363229225, 17430497086, 101901374524, 331179473681, 1936126175213, 6292410089388, 36786397511512, 119555791973835, 698941553280624, 2271560048351176
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OFFSET

0,2


COMMENTS

Number of terms of A067030 below 10^n.
a(16)a(18) are based on two empirically detected recursive formulas. [Lars Blomberg, Nov 25 2011]


LINKS

Hiroaki Yamanouchi, Table of n, a(n) for n = 0..100
Lars Blomberg, A short investigation of the sequence and derivation of the recursive formulas
Index entries for sequences related to Reverse and Add!


EXAMPLE

a(1) = 5 since 0, 2, 4, 6, 8 are the terms of A067030 which are smaller than 10^1.


CROSSREFS

Cf. A067030.
Sequence in context: A280067 A158615 A321652 * A206709 A199480 A339079
Adjacent sequences: A088177 A088178 A088179 * A088181 A088182 A088183


KEYWORD

nonn,base


AUTHOR

Klaus Brockhaus, Sep 22 2003


EXTENSIONS

a(9)a(10) from Donovan Johnson, Sep 22 2009
a(11)a(18) from Lars Blomberg, Dec 19 2011
a(19)a(24) from Hiroaki Yamanouchi, Sep 04 2014


STATUS

approved



