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A030656 Pair up the numbers. 4
1, 23, 45, 67, 89, 1011, 1213, 1415, 1617, 1819, 2021, 2223, 2425, 2627, 2829, 3031, 3233, 3435, 3637, 3839, 4041, 4243, 4445, 4647, 4849, 5051, 5253, 5455, 5657, 5859, 6061, 6263, 6465, 6667, 6869, 7071, 7273, 7475, 7677, 7879, 8081, 8283, 8485, 8687 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..43.

MATHEMATICA

FromDigits[Flatten[IntegerDigits/@#]]&/@Partition[Range[0, 87], 2] (* Harvey P. Dale, Jan 24 2012 *)

PROG

(MAGMA) [Seqint(Intseq(n+1) cat Intseq(n)): n in [0..86 by 2]];  // Bruno Berselli, Jun 18 2011

(PARI) a(n)=eval(Str(2*n, 2*n+1)) \\ Charles R Greathouse IV, Jul 21 2016

CROSSREFS

Cf. A030655.

Sequence in context: A003859 A058545 A161709 * A122041 A266706 A040506

Adjacent sequences:  A030653 A030654 A030655 * A030657 A030658 A030659

KEYWORD

base,nonn,easy

AUTHOR

Maghraoui Abdelkader

EXTENSIONS

More terms from Erich Friedman.

STATUS

approved

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Last modified February 19 03:28 EST 2018. Contains 299330 sequences. (Running on oeis4.)