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A073730 Concatenation of largest and smallest digits of n in decimal representation. 2
11, 22, 33, 44, 55, 66, 77, 88, 99, 10, 11, 21, 31, 41, 51, 61, 71, 81, 91, 20, 21, 22, 32, 42, 52, 62, 72, 82, 92, 30, 31, 32, 33, 43, 53, 63, 73, 83, 93, 40, 41, 42, 43, 44, 54, 64, 74, 84, 94, 50, 51, 52, 53, 54, 55, 65, 75, 85, 95, 60, 61, 62, 63, 64, 65, 66, 76, 86, 96 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

10 <= a(n) <= 99; a(a(n))=a(n).

LINKS

Reinhard Zumkeller, Table of n, a(n) for n = 1..10000

FORMULA

a(n) = A054055(n)*10 + A054054(n).

EXAMPLE

a(12321)=31; a(3210123)=30; a(59387)=83; a(8923)=92.

MATHEMATICA

Table[FromDigits[{Max[x = IntegerDigits[n]], Min[x]}], {n, 69}] (* Jayanta Basu, Jul 08 2013 *)

PROG

(Haskell)

a073730 n = 10 * a054055 n + a054054 n

-- Reinhard Zumkeller, Jul 21 2013

CROSSREFS

Cf. A073729.

Sequence in context: A013576 A065998 A073729 * A087346 A060314 A337240

Adjacent sequences:  A073727 A073728 A073729 * A073731 A073732 A073733

KEYWORD

nonn,base,look

AUTHOR

Reinhard Zumkeller, Aug 05 2002

STATUS

approved

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Last modified September 26 23:47 EDT 2020. Contains 337378 sequences. (Running on oeis4.)