

A233552


Odd integers k such that for every m >= 1 the numbers k*4^m  1 have at least three prime factors, not necessarily distinct, and k*4^m  1 has at least twoelement covering set.


1



361, 919, 1681, 1849, 2419, 2629, 3301, 5209, 5539, 5581, 6421, 7771, 8551, 9109, 9871, 10039, 10609, 10819, 11491, 13399, 13729, 13771, 14611, 15661, 15961, 16741, 17299, 18061, 18229, 18799, 19009, 19681, 21589, 21919, 21961, 22801, 24151, 24931, 25489
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OFFSET

1,1


COMMENTS

Here an nelement covering set is a minimal set of n distinct primes such that at least one of these primes divides every integer in the sequence k*4^m  1, m >= 1.  Arkadiusz Wesolowski, Jul 21 2021


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KEYWORD

nonn


AUTHOR



EXTENSIONS



STATUS

approved



