

A112392


Squares of the form 3*semiprime(n)  2.


2



16, 25, 64, 100, 169, 256, 361, 400, 529, 625, 676, 784, 961, 1156, 1444, 2116, 2209, 3136, 3721, 3844, 4096, 4489, 5041, 5929, 7744, 7921, 8281, 9604, 10000, 10201, 11236, 11449, 11881, 12100, 13456, 14641, 16129, 16384, 17161, 18496, 20164
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OFFSET

1,1


LINKS

Table of n, a(n) for n=1..41.


MATHEMATICA

Select[3#2&/@Select[Range[7000], PrimeOmega[#]==2&], IntegerQ[ Sqrt[#]]&] (* Harvey P. Dale, Jun 22 2011 *)


PROG

(PARI) for(i=1, 15000, if(bigomega(i)==2&&issquare(3*i2), print1(3*i2, ", "))) (Herrgesell)


CROSSREFS

Cf. A112393.
Sequence in context: A118489 A110922 A065408 * A109685 A188826 A152152
Adjacent sequences: A112389 A112390 A112391 * A112393 A112394 A112395


KEYWORD

nonn


AUTHOR

Giovanni Teofilatto, Dec 05 2005


EXTENSIONS

More terms from Lambert Herrgesell (zero815(AT)googlemail.com), Dec 12 2005


STATUS

approved



