1807
This number is a composite.
Just showing those entries submitted by 'Sariyar': (Click here to show all)
1807 = 13 × 139 -> 131807139 = 3 × 43935713 ->
313180713943935713 = 8701193 × 35992847641 ->
870119331318071394393571335992847641 = 4872702848504903 ×
178570160826665452447 ->
4872702848504903870119331318071394393571335992847641178570160826665452447
= 74923 ×
65036141752264376361322041536929839883231264002344289184498229204189. Note that each new semiprime begins and ends with the ordered factors of the previous one. Can you find a larger chain? See PC14. [Sariyar]
Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell