id:A073729 - OEIS Search Results

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Concatenation of initial and final digits of n in decimal representation.

+0
10

11, 22, 33, 44, 55, 66, 77, 88, 99, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`10 <= a(n) <= 99; a(a(n))=a(n).`
	FORMULA	`a(n) = A000030(n)*10 + A010879(n).`
	EXAMPLE	`a(12321)=11; a(3210123)=33; a(59387)=57; a(8923)=83.`
	CROSSREFS	`Cf. A073731, A073730.` `Sequence in context: A054728 A013576 A065998 this_sequence A073730 A087346 A060314` `Adjacent sequences: A073726 A073727 A073728 this_sequence A073730 A073731 A073732`
	KEYWORD	`nonn,base`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)lhsystems.com), Aug 05 2002`

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Last modified July 25 07:41 EDT 2008. Contains 142293 sequences.

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