A089183 - OEIS

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A089183

Palindromes in which, in the first half of the number, digits appear in the order 1, 0, 2, 3, 1, 0, 2, 3, 1, ...

1, 11, 101, 1001, 10201, 102201, 1023201, 10233201, 102313201, 1023113201, 10231013201, 102310013201, 1023102013201, 10231022013201, 102310232013201, 1023102332013201, 10231023132013201, 102310231132013201

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OFFSET

1,2

COMMENTS

A method of altering the order in the digit sets of palindromic numbers and making continued fractions from them.

LINKS

Table of n, a(n) for n=1..18.

FORMULA

c[1]=1 c[2]=0 c[3]=2 c[0]=3 a[m] = Delete[Table[If [ Floor[m/2]-n>=0, c[ Mod[n, 4]], c[Mod[m-n, 4]]], {n, 1, m}], m] b[m]=Sum[a[m][[i]]*10^(i-1), {i, 1, m-1}]

MATHEMATICA

digits=50 c={1, 0, 2, 3} a[m_]=Delete[Table[If [ Floor[m/2]-n>=0, c[[ Mod[n, 4]]], c[[Mod[m-n, 4]]]], {n, 1, m}], m] b=Table[Sum[a[m][[i]]*10^(i-1), {i, 1, m-1}], {m, 2, digits}]

CROSSREFS

Cf. A007907.

Sequence in context: A000533 A147759 A147757 * A164046 A284235 A284299

Adjacent sequences: A089180 A089181 A089182 * A089184 A089185 A089186

KEYWORD

nonn,base

AUTHOR

Roger L. Bagula, Dec 07 2003

EXTENSIONS

Edited by N. J. A. Sloane, Jan 05 2009.

STATUS

approved