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A088642 If k is a palindrome made of only two nonzero digits a and b then the palindrome arising by swaping the digits a and b. 0
212, 313, 414, 515, 616, 717, 818, 919, 121, 323, 424, 525, 626, 727, 828, 929, 131, 232, 434, 535, 636, 737, 838, 939, 141, 242, 343, 545, 646, 747, 848, 949, 151, 252, 353, 454, 656, 757, 858, 959 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

If a(r) = s then a(s) = r.

LINKS

Table of n, a(n) for n=1..40.

EXAMPLE

The term corresponding to 1221221 is 2112112 and vice versa.

CROSSREFS

Sequence in context: A099687 A133651 A093807 * A251126 A078211 A158794

Adjacent sequences:  A088639 A088640 A088641 * A088643 A088644 A088645

KEYWORD

base,easy,nonn

AUTHOR

Amarnath Murthy, Oct 27 2003

STATUS

approved

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Last modified December 12 15:11 EST 2019. Contains 329960 sequences. (Running on oeis4.)