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A157937
Numbers n divisible by the least prime >= sqrt(n) which are not in A001248 (primes squared).
4
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
OFFSET
1,1
COMMENTS
A subsequence of A157936, contains A157938 as subsequence: cf. formulas.
LINKS
FORMULA
Equals A157936 \ A001248 = A157938 union A006094.
PROG
(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: A315265 A315266 A315267 * A080255 A337185 A324972
KEYWORD
nonn
AUTHOR
M. F. Hasler, Mar 10 2009
STATUS
approved