id:A135642 - OEIS Search Results

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Concave numbers.

+0
5

110, 120, 121, 122, 130, 131, 132, 133, 134, 140, 141, 142, 143, 144, 145, 146, 150, 151, 152, 153, 154, 155, 156, 157, 158, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175, 176, 177, 178, 179, 180, 181, 182 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`The structure of digits represent a concave function or a concave object. In the graphic representation the points are connected by imaginary line segments (or line curves) from left to right.`
	EXAMPLE	`The number 12221 is a concave number and the number of this sequence (A135642) is also a concave number:` `. . . . . .` `. . . . . .` `. . . . . .` `. . . 6 . .` `. . 5 . . .` `. . . . 4 .` `. 3 . . . .` `. . . . . 2` `1 . . . . .` `. . . . . .`
	CROSSREFS	`Adjacent sequences: A135639 A135640 A135641 this_sequence A135643 A135644 A135645` `Sequence in context: A113556 A112891 A036230 this_sequence A084042 A110735 A101317`
	KEYWORD	`nonn,base`
	AUTHOR	`Omar E. Pol (info(AT)polprimos.com), Nov 30 2007`

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Last modified October 6 12:54 EDT 2008. Contains 144667 sequences.

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