id:A157937 - OEIS Search Results

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Numbers n divisible by the least prime >= sqrt(n) which are not in A001248 (primes squared).

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6, 10, 15, 20, 28, 35, 42, 55, 66, 77, 88, 99, 110, 130, 143, 156, 170, 187, 204, 221, 238, 255, 272, 304, 323, 342, 368, 391, 414, 437, 460, 483, 506, 551, 580, 609, 638, 667, 696, 725, 754, 783, 812, 868, 899, 930, 962, 999, 1036, 1073, 1110, 1147, 1184, 1221 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`A subsequence of A157936, contains A157938 as subsequence: cf. formulae.`
	FORMULA	`A157937 = A157936 \ A001248 = A157938 union A006094.`
	PROGRAM	`(PARI) for( n=5, 1999, n % nextprime(sqrtint(n-1)+1) & next; omega(n)>1 & print1(n", ")) /* sqrtint(n-1)+1 avoids rounding errors but could be replaced by sqrt(n) for small n */`
	CROSSREFS	`Cf. A157941.` `Sequence in context: A162731 A145286 A006987 this_sequence A080255 A115744 A122783` `Adjacent sequences: A157934 A157935 A157936 this_sequence A157938 A157939 A157940`
	KEYWORD	`nonn`
	AUTHOR	`M. F. Hasler (MHasler(AT)univ-ag.fr), Mar 10 2009`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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