id:A134853 - OEIS Search Results

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Mountain numbers.

+0
6

1, 2, 3, 4, 5, 6, 7, 8, 9, 120, 121, 130, 131, 132, 140, 141, 142, 143, 150, 151, 152, 153, 154, 160, 161, 162, 163, 164, 165, 170, 171, 172, 173, 174, 175, 176, 180, 181, 182, 183, 184, 185, 186, 187, 190, 191, 192, 193, 194, 195, 196 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`a(1) to a(9) are equal to A000027. For n>9 the structure of the digits represent a mountain. The first digits are in increasing order. The last digits are in decreasing order. The numbers only have one largest digit that represent the top of the mountain. This sequence is finite. The last member is 123456789876543210.`
	EXAMPLE	`The number of this sequence (A134853) is a mountain number.` `. . . . . .` `. . . 8 . .` `. . . . . .` `. . . . . .` `. . . . 5 .` `. . 4 . . .` `. 3 . . . 3` `. . . . . .` `1 . . . . .` `. . . . . .`
	CROSSREFS	`Cf. A134931, A134941.` `Adjacent sequences: A134850 A134851 A134852 this_sequence A134854 A134855 A134856` `Sequence in context: A082232 A117228 A032567 this_sequence A134810 A004871 A059405`
	KEYWORD	`base,fini,nonn`
	AUTHOR	`Omar E. Pol (info(AT)polprimos.com), Nov 26 2007, corrected May 15 2008`

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Last modified January 8 02:43 EST 2009. Contains 152824 sequences.

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