# Known 15-digit prime factors of Googolplex - 1

1. Alpertron
2. Number Theory
3. Known 15-digit prime factors of Googolplex − 1

This is a list of known 15-digit prime factors of googolplex − 1, i.e., 1010^100 − 1.

These numbers have the form 1 + 2k × 2m × 5n, where 0 ≤ m ≤ 100 and 0 ≤ n ≤ 100.

In the list you can see the prime factors and their corresponding value of k.

1. 10170 2694862849 (Dario Alpern, k=6061953)
2. 10485 7600000001 (Phil Carmody, k=1)
3. 10500 0000000001 (Phil Carmody, k=21)
4. 11718 7500000001 (Phil Carmody, k=3)
5. 12067 0126080001 (Phil Carmody, k=2877)
6. 12993 1640625001 (Phil Carmody, k=2661)
7. 13652 6272921601 (Phil Carmody, k=2543)
8. 14766 2045184001 (Dario Alpern, k=281643)
9. 16777 2160000001 (Phil Carmody, k=1)
10. 17152 3813933057 (Phil Carmody, k=39)
11. +176144543406001 () (k=88072271703)
12. 18867 1875000001 (Phil Carmody, k=483)
13. 19200 0000000001 (Phil Carmody, k=3)
14. 20280 7304687501 (Dario Alpern, k=5191867)
15. +204322984500001 (Dario Alpern) (k=408645969)
16. 21683 2000000001 (Phil Carmody, k=847)
17. 23146 9209354241 (Dario Alpern, k=86229)
18. 25600 0000000001 (Phil Carmody, k=1)
19. 27832 0312500001 (Phil Carmody, k=57)
20. 28124 1085542401 (Dario Alpern, k=670531)
21. 29360 1280000001 (Phil Carmody, k=7)
22. 29553 8688000001 (Dario Alpern, k=72153)
23. 30720 0000000001 (Phil Carmody, k=3)
24. 40960 0000000001 (Phil Carmody, k=1)
25. 45776 3671875001 (Phil Carmody, k=3)
26. 50577 5348776961 (Phil Carmody, k=23)
27. 52420 8984375001 (Dario Alpern, k=53679)
28. 65536 0000000001 (Phil Carmody, k=1)
29. 77661 1328125001 (Dario Alpern, k=3181)
30. 80654 6875000001 (Dario Alpern, k=51619)
31. 82948 7500000001 (Dario Alpern, k=66359)
32. +834427406578561 () (k=1303792822779)
33. 94437 7409044481 (Dario Alpern, k=5497)