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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 7 |
| 3 | 13 |
| 4 | 19 |
| 5 | 31 |
| 6 | 37 |
| 7 | 49 |
| 8 | 67 |
| 9 | 109 |
| 10 | 139 |
| 11 | 181 |
| 12 | 217 |
| 13 | 247 |
| 14 | 301 |
| 15 | 307 |
| 16 | 319 |
| 17 | 391 |
| 18 | 409 |
| 19 | 451 |
| 20 | 517 |
| 21 | 541 |
| 22 | 697 |
| 23 | 721 |
| 24 | 769 |
| 25 | 787 |
| 26 | 811 |
| 27 | 829 |
| 28 | 847 |
| 29 | 877 |
| 30 | 931 |
| 31 | 937 |
| 32 | 991 |
| 33 | 1039 |
| 34 | 1099 |
| 35 | 1117 |
| 36 | 1189 |
| 37 | 1327 |
| 38 | 1381 |
| 39 | 1399 |
| 40 | 1507 |
| 41 | 1669 |
| 42 | 1729 |
| 43 | 1777 |
| 44 | 1801 |
| 45 | 1819 |
| 46 | 1921 |
| 47 | 1957 |
| 48 | 1981 |
| 49 | 2047 |
| 50 | 2179 |
| 51 | 2251 |
| 52 | 2281 |
[4,7,13,19,31,37,49,67,109,139,181,217,247,301, 307,319,391,409,451,517,541,697,721,769,787,811, 829,847,877,931,937,991,1039,1099,1117,1189,1327, 1381,1399,1507,1669,1729,1777,1801,1819,1921,1957, 1981,2047,2179,2251,2281] |