id:A110300 - OEIS Search Results

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Not-really primes: numbers n such that n - 1, n and n + 1 all have only 1 or 2 prime factors.

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3, 4, 5, 6, 10, 14, 22, 34, 38, 58, 86, 94, 122, 142, 158, 178, 202, 214, 218, 302, 382, 394, 446, 502, 542, 634, 698, 718, 842, 878, 922, 1042, 1138, 1202, 1262, 1318, 1346, 1382, 1402, 1438, 1622, 1642, 1762, 1822, 1838, 1894, 1942, 1982, 2018, 2102 (list; graph; listen)

	OFFSET	`1,1`
	LINKS	`Walter Nissen, Home Page (listed in lieu of email address)`
	EXAMPLE	`14 is in the sequence because 13, 14 and 15 have only 1, 2 and 2 prime factors respectively, viz. 13, 2 * 7 and 3 * 5.`
	CROSSREFS	`Cf. A000040, A106639.` `Sequence in context: A164977 A103033 A099561 this_sequence A143713 A089912 A047425` `Adjacent sequences: A110297 A110298 A110299 this_sequence A110301 A110302 A110303`
	KEYWORD	`easy,nonn`
	AUTHOR	`Walter Nissen Aug 03 2005`

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Last modified November 29 12:46 EST 2009. Contains 167659 sequences.

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