Prime factorization of terms:
F_0 = 3, F_1 = 5, F_2 = 17, F_3 = 257 are Fermat numbers (cf. A000215)
6495105 = 3 * 5 * 17 * 25471
848629545 = 3 * 5 * 17 * 461 * 7219
1117175145 = 3 * 5 * 17 * 257 * 17047
2544265305 = 3^2 * 5 * 17 * 257 * 12941
3147056235 = 3^2 * 5 * 17 * 257 * 16007
3366991695 = 3 * 5 * 17 * 83 * 257 * 619
3472109835 = 3 * 5 * 17 * 257 * 52981
3621922845 = 3 * 5 * 17^2 * 257 * 3251
3861518805 = 3^3 * 5 * 17 * 257 * 6547
4447794915 = 3^3 * 5 * 17 * 257 * 7541
4848148485 = 3^4 * 5 * 17 * 704161
5415281745 = 3 * 5 * 17 * 21236399
5693877405 = 3^2 * 5 * 17 * 257 * 28961
6804302445 = 3^2 * 5 * 17 * 53 * 257 * 653
7525056375 = 3^2 * 5^3 * 17 * 257 * 1531
7602256605 = 3 * 5 * 17 * 257 * 311 * 373
9055691835 = 3 * 5 * 17 * 257 * 138181
9217432215 = 3^2 * 5 * 17 * 173 * 257 * 271
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