[seqfan] Partial sums of even and odd semiprimes
israel at math.ubc.ca
israel at math.ubc.ca
Mon Apr 10 04:34:52 CEST 2023
Zak Seidov pointed out to me that 62234 and 199370 are partial sums of both
the even semiprimes and the odd semiprimes:
62234 = 4 + 6 + 10 + 14 + ... + 1226 (112 terms)
= 9 + 15 + 21 + 25 + ... + 779 (158 terms)
199370 = 4 + 6 + 10 + 14 + ... + 2302 (190 terms)
= 9 + 15 + 21 + 25 + ... + 1385 (284 terms) I did not find any more
examples using semiprimes up to 10^7. Are there likely to be any others?
Can anyone find some? If not, two terms would normally be too few for a
sequence, but maybe an exception could be made in this case?
Cheers,
Robert
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