and 1 contributors

# NAME

Math::NumSeq::ConcatNumbers -- concatenate digits of i, i+1

# SYNOPSIS

`````` use Math::NumSeq::ConcatNumbers;
my \$seq = Math::NumSeq::ConcatNumbers->new;
my (\$i, \$value) = \$seq->next;``````

# DESCRIPTION

The concatenation of i and i+1 as digits, starting from i=0,

``    1, 12, 23, 34, 45, 56, 67, 78, 89, 910, 1011, 1112, ...``

The default is decimal, or optional `radix` parameter selects another base.

Since the two i and i+1 usually have the same number of digits, the resulting concatenated value has an even number of digits. The exception is at i=9 i+1=10, or i=99 i+1=100, etc, i=99..99 when the resulting value has an odd number of digits.

Being an even number of digits makes power gaps between for instance 89 and 1011, then 998999 and 10001001.

## Concat Count

Option `concat_count => \$c` selects how many of i,i+1,i+2,i+3,etc are concatenated. For example `concat_count => 3` gives

``    12, 123, 234, 345, 456, 567, 678, 789, 8910, 91011, 101112, 111213, ...``

`concat_count => 1` means all integers (the same as Math::NumSeq::All).

# FUNCTIONS

See "FUNCTIONS" in Math::NumSeq for the behaviour common to all path classes.

`\$seq = Math::NumSeq::ConcatNumbers->new ()`
`\$seq = Math::NumSeq::ConcatNumbers->new (radix => \$r, concat_count => \$c)`

Create and return a new sequence object.

## Random Access

`\$value = \$seq->ith(\$i)`

Return the concatenation of `\$i`, `\$i+1`, etc.

# HOME PAGE

http://user42.tuxfamily.org/math-numseq/index.html

# LICENSE

Copyright 2011, 2012, 2013 Kevin Ryde

Math-NumSeq is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3, or (at your option) any later version.

Math-NumSeq is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with Math-NumSeq. If not, see <http://www.gnu.org/licenses/>.