OFFSET
1,1
COMMENTS
The sets are chosen to minimize the larger of the two start values, so for example, (6,7) and (10,11) would be chosen over (5,6) and (13,14) since 10 is less than 13.
The sequence can be read as follows:
2, 3,
6,7, 10,11,
11,12,13, 17,18,19,
68,69,70,71, 76,77,78,79,
130,131,132,133,134, 138,139,140,141,142
88,89,90,91,92,93, 232,233,234,235,236,237
658,659,660,661,662,663,664, 1090,1091,1092,1093,1094,1095,1096
etc
LINKS
Matthijs Coster, improved Sage program for computing A208892
EXAMPLE
At n=4, the consecutive numbers 68, 69, 70, and 71 have the same prime signature as 76, 77, 78, and 79. Both have the form p^2*q, p*q, p*q*r, and p, respectively.
CROSSREFS
KEYWORD
nonn,tabf
AUTHOR
Matthijs Coster, Mar 03 2012
STATUS
approved