# This is the b125527.txt text file. # A125527: Number of semiprimes <= 2^n. # a(1)-a(49) by RGWv, a(48) corrected and extended to 57 by Dana Jacobsen. # Used the data by Dana Jacobsen in A120033 for a(58) - a(63). # Dated 18 March 2022. 1 0 2 1 3 2 4 6 5 10 6 22 7 42 8 82 9 157 10 304 11 589 12 1124 13 2186 14 4192 15 8110 16 15658 17 30253 18 58546 19 113307 20 219759 21 426180 22 827702 23 1608668 24 3129211 25 6091437 26 11868599 27 23140878 28 45150717 29 88157689 30 172235073 31 336717854 32 658662065 33 1289149627 34 2524532330 35 4946320619 36 9696090315 37 19015826478 38 37310368709 39 73237005168 40 143817246008 41 282528883551 42 555237939294 43 1091574618496 44 2146738817329 45 4223287872953 46 8311168557633 47 16360940729894 48 32216929163102 49 63457786440404 50 125027663135664 51 246401562625117 52 485727708027940 53 957746412122119 54 1888916491053636 55 3726284941841117 56 7352535573376770 57 14510848832845041 58 28644424519528512 59 56555665405788147 60 111685842309849897 61 220598984393061174 62 435802554444335050 63 861101852602340550