kolstad (05/13/82)
#N:uiucdcs:10300001:000:373
uiucdcs!kolstad May 13 10:29:00 1982
My colleague recently asked me the following question:
Are all decimal numbers of length 6k-1 (k>0) consisting of all 1's
composite? (e.g., 11111 = 41*271; 11111111111 = 21649 * 513239).
I have deduced a general function for the numbers:
6k-1
10 - 1
f(k) = -----------
9
but this has helped me not. Anyone got any suggestions?glenn (05/14/82)
form 6k plus-or-minus 1, where "k" is a positive integer. Sounds really nifty until you figure out just how mundane an observation it is. - Glenn