n a(n) prime factorization of a(n) sigma(a(n))/a(n) (rounded) 1 3465 3^2 * 5 * 7 * 11 2.161038961 2 15015 3 * 5 * 7 * 11 * 13 2.148251748 3 4095 3^2 * 5 * 7 * 13 2.133333333 4 1430 2 * 5 * 11 * 13 2.114685315 5 19635 3 * 5 * 7 * 11 * 17 2.112146677 6 16796 2^2 * 13 * 17 * 19 2.100500119 7 20 2^2 * 5 2.100000000 8 21945 3 * 5 * 7 * 11 * 19 2.099794942 9 5355 3^2 * 5 * 7 * 17 2.097478992 10 692835 3 * 5 * 11 * 13 * 17 * 19 2.095044275 11 2584 2^3 * 17 * 19 2.089783282 12 5985 3^2 * 5 * 7 * 19 2.085213033 13 23205 3 * 5 * 7 * 13 * 17 2.085067873 14 49742 2 * 7 * 11 * 17 * 19 2.084355273 15 20332 2^2 * 13 * 17 * 23 2.082234901 16 22309287 3 * 7 * 11 * 13 * 17 * 19 * 23 2.082031577 17 26565 3 * 5 * 7 * 11 * 23 2.081535855 18 188955 3^2 * 5 * 13 * 17 * 19 2.080495356 19 1870 2 * 5 * 11 * 17 2.079144385 20 216315 3^2 * 5 * 11 * 19 * 23 2.076971084 21 838695 3 * 5 * 11 * 13 * 17 * 23 2.076826498 22 25935 3 * 5 * 7 * 13 * 19 2.072874494 23 3128 2^3 * 17 * 23 2.071611253 24 22724 2^2 * 13 * 19 * 23 2.070058088 25 6084351 3^2 * 7 * 13 * 17 * 19 * 23 2.067573025 26 7245 3^2 * 5 * 7 * 23 2.067080745 27 2090 2 * 5 * 11 * 19 2.066985646 28 60214 2 * 7 * 11 * 17 * 23 2.066230445 29 2107575 3^2 * 5^2 * 17 * 19 * 29 2.065122238 30 937365 3 * 5 * 11 * 13 * 19 * 23 2.064681314 31 1542773001 3 * 7 * 11 * 17 * 19 * 23 * 29 * 31 2.064496590 32 25636 2^2 * 13 * 17 * 29 2.064284600 33 28129101 3 * 7 * 11 * 13 * 17 * 19 * 29 2.064083029 34 33495 3 * 5 * 7 * 11 * 29 2.063591581 35 13066965 3^2 * 5 * 17 * 19 * 29 * 31 2.062973307 36 3016174 2 * 7 * 17 * 19 * 23 * 29 2.062480480 37 228735 3^2 * 5 * 13 * 17 * 23 2.062404092 38 9354675 3 * 5^2 * 11 * 17 * 23 * 29 2.061480490 39 5775 3 * 5^2 * 7 * 11 2.061298701 40 29348 2^2 * 11 * 23 * 29 2.060787788 41 2252925 3^2 * 5^2 * 17 * 19 * 31 2.060681115 42 27404 2^2 * 13 * 17 * 31 2.059845278 43 2629575 3^2 * 5^2 * 13 * 29 * 31 2.059770115 44 30069039 3 * 7 * 11 * 13 * 17 * 19 * 31 2.059644141 45 3496 2^3 * 19 * 23 2.059496568 46 57998985 3 * 5 * 11 * 17 * 23 * 29 * 31 2.059335349 47 35805 3 * 5 * 7 * 11 * 31 2.059153749 48 272745 3^2 * 5 * 11 * 19 * 29 2.059066161 49 1057485 3 * 5 * 11 * 13 * 17 * 29 2.058922822 50 7857927 3^2 * 7 * 11 * 17 * 23 * 29 2.058313853 51 3224186 2 * 7 * 17 * 19 * 23 * 31 2.058045038 52 58786 2 * 7 * 13 * 17 * 19 2.057632770 53 289275 3 * 5^2 * 7 * 19 * 29 2.057557687 54 113390 2 * 5 * 17 * 23 * 29 2.057324279 55 70 2 * 5 * 7 2.057142857 56 3763214 2 * 7 * 13 * 23 * 29 * 31 2.057135204 57 9999825 3 * 5^2 * 11 * 17 * 23 * 31 2.057047198 58 47025 3^2 * 5^2 * 11 * 19 2.056778309 59 182325 3 * 5^2 * 11 * 13 * 17 2.056635130 60 31372 2^2 * 11 * 23 * 31 2.056355986 61 572 2^2 * 11 * 13 2.055944056 62 1793505 3 * 5 * 7 * 19 * 29 * 31 2.055416628 63 19550 2 * 5^2 * 17 * 23 2.055038363 64 31395 3 * 5 * 7 * 13 * 23 2.054849498 65 291555 3^2 * 5 * 11 * 19 * 31 2.054638061 66 1130415 3 * 5 * 11 * 13 * 17 * 31 2.054495031 67 67298 2 * 7 * 11 * 19 * 23 2.054147226 68 1841374227 3 * 7 * 11 * 17 * 19 * 23 * 29 * 37 2.054034614 69 8399853 3^2 * 7 * 11 * 17 * 23 * 31 2.053887372 70 3944 2^3 * 17 * 29 2.053752535 71 153153 3^2 * 7 * 11 * 13 * 17 2.053475936 72 500900325 3 * 5^2 * 17 * 19 * 23 * 29 * 31 2.053313900 73 309225 3 * 5^2 * 7 * 19 * 31 2.053132832 74 9132825 3 * 5^2 * 13 * 17 * 19 * 29 2.052902579 75 121210 2 * 5 * 17 * 23 * 31 2.052899926 76 213239601575 5^2 * 7 * 11 * 13 * 17 * 19 * 23 * 31 * 37 2.052770593 77 1571452 2^2 * 19 * 23 * 29 * 31 2.052623943 78 2047395 3 * 5 * 7 * 17 * 31 * 37 2.052606361 79 15596055 3^2 * 5 * 17 * 19 * 29 * 37 2.052519050 80 2210 2 * 5 * 13 * 17 2.052488688 81 517605543 3^2 * 7 * 13 * 19 * 29 * 31 * 37 2.052330417 82 28652 2^2 * 13 * 19 * 29 2.052212760 83 143354354 2 * 11 * 13 * 19 * 23 * 31 * 37 2.052080818 84 272 2^4 * 17 2.051470588 85 44818137 3^3 * 7 * 13 * 17 * 29 * 37 2.051169597 86 5122502 2 * 7 * 11 * 29 * 31 * 37 2.050997735 87 56623515 3 * 5 * 13 * 17 * 19 * 29 * 31 2.050766364 88 255645 3^2 * 5 * 13 * 19 * 23 2.050343249 89 2688975 3^2 * 5^2 * 17 * 19 * 37 2.050238474 90 420756273 3^2 * 7 * 17 * 19 * 23 * 29 * 31 2.050159808 91 14710275 3^3 * 5^2 * 19 * 31 * 37 2.050050050