id:A124665 - OEIS Search Results

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Numbers that cannot be either prefixed or followed by one digit to form a prime.

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20, 32, 62, 84, 114, 126, 134, 135, 146, 150, 164, 168, 176, 185, 192, 196, 204, 210, 218, 232, 236, 240, 248, 256, 258, 282, 294, 298, 305, 314, 315, 324, 326, 328, 342, 348, 350, 356, 366, 368, 374, 375, 378, 395, 406, 408, 410, 414, 416, 418 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`Prefixing by 0 gives you the number itself. This way it is implicitly assumed that a(n) is not prime.`
	EXAMPLE	`If you prefix 20 with any digit you will get an even number. Also 201, 203, 207 and 209 are all composite.`
	CROSSREFS	`The sequence A032737 = a(n) cannot be prefixed or followed by any digit to form a prime - allows you to prefix and postfix at the same time.` `Sequence in context: A116131 A075035 A032352 this_sequence A134989 A119873 A075230` `Adjacent sequences: A124662 A124663 A124664 this_sequence A124666 A124667 A124668`
	KEYWORD	`base,nonn`
	AUTHOR	`Tanya Khovanova (tanyakh(AT)yahoo.com), Dec 23 2006`

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Last modified December 15 00:47 EST 2009. Contains 170825 sequences.

AT&T Labs Research