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A100846 Numbers with decimal expansion 1nn1. +0
7
1111, 1221, 1331, 1441, 1551, 1661, 1771, 1881, 1991, 110101, 111111, 112121, 113131, 114141, 115151, 116161, 117171, 118181, 119191, 120201, 121211, 122221, 123231, 124241, 125251, 126261, 127271, 128281, 129291, 130301, 131311, 132321 (list; graph; listen)
OFFSET

0,1

EXAMPLE

If n=5, 1nn1 is 1551

If n=10, 1nn1 is 110101

MATHEMATICA

For[n = 1, n < 30, n++, l := Floor[Log[10, n] + 1]; gvout := (n*10^l + n)*10 + 1; m := Floor[Log[10, gvout]]; giveout := 10^(m + 1) + out; Print[giveout]] (Steinerberger)

CROSSREFS

Sequence in context: A036105 A036103 A086887 this_sequence A072434 A033285 A085109

Adjacent sequences: A100843 A100844 A100845 this_sequence A100847 A100848 A100849

KEYWORD

nonn,base

AUTHOR

Parthasarathy Nambi (PachaNambi(AT)yahoo.com), Jan 07 2005

EXTENSIONS

More terms from Stefan Steinerberger (stefan.steinerberger(AT)gmail.com), Jan 27 2006

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Last modified September 8 08:06 EDT 2008. Contains 143486 sequences.


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