A124940 Numbers n such that n and n+3 are 3-almost primes.

27, 42, 63, 75, 99, 102, 114, 171, 172, 242, 255, 258, 279, 282, 322, 354, 363, 366, 385, 399, 423, 425, 426, 435, 452, 474, 531, 575, 595, 602, 603, 606, 615, 639, 642, 651, 654, 665, 722, 759, 772, 830, 844, 894, 903, 906, 932, 935, 978