OFFSET
1,1
COMMENTS
Contains all strictly positive even numbers A005843.
For each odd k>1 we can accumulate the numbers == k^2-2 (mod 2k) in a row, the last entry equal to A073577(k):
7; (k=3)
13, 23; (k=5)
19, 33, 47; (k=7)
25, 43, 61, 79; (k=9)
31, 53, 75, 97, 119; (k=11)
7, 63, 89, 115, 141, 167; (k=13)
43, 73, 103, 133, 163, 193,223; (k=17)
49, 83, 17, 151,185, 219, 253, 287; (k=19)
Each element T of this table has the format T= k^2-2-j*2*k, so T+2 is of the form k*(k-2*j), therefore not prime, and consequently all elements T are in the sequence.
CROSSREFS
KEYWORD
nonn
AUTHOR
Vincenzo Librandi, Dec 20 2008
EXTENSIONS
Edited, 41, 59 (see A102540) etc. inserted by R. J. Mathar, Oct 16 2009
STATUS
approved