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A165144
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Number of semiprimes between two primes squared.
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1
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1, 5, 7, 22, 15, 33, 23, 49, 88, 35, 114, 79, 48, 100, 148, 189, 57, 201, 139, 78, 230, 158, 269, 370, 192, 102, 215, 112, 211, 803, 259, 390, 150, 666, 147, 430, 471, 317, 485, 506, 152, 869, 168, 364, 184, 1144, 1213, 404, 206, 433, 613, 217, 1134, 702, 720, 712
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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MAPLE
| A165144 := proc(n) a := 0 ; for k from ithprime(n)^2+1 to ithprime(n+1)^2-1 do if numtheory[bigomega](k) = 2 then a := a+1 ; fi ; end do ; a ; end proc: seq(A165144(n), n=1..80) ; [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jan 30 2010]
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CROSSREFS
| Sequence in context: A179189 A030735 A162462 * A084164 A036498 A076409
Adjacent sequences: A165141 A165142 A165143 * A165145 A165146 A165147
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KEYWORD
| nonn
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AUTHOR
| Giovanni Teofilatto (g.teofilatto(AT)tiscalinet.it), Sep 05 2009
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EXTENSIONS
| a(7) corrected and terms beyond a(7) added by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jan 30 2010
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