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A353765
Numbers k for which A353749(k) is a multiple of A353749(sigma(k)), where A353749(k) = phi(k) * A064989(k), and A064989 shifts the prime factorization one step towards lower primes.
3
1, 3, 5, 15, 27, 459, 819, 2295, 13923, 69615, 361179, 3282147, 6140043, 16410735, 30700215, 99558459, 277788987, 497792295, 1388944935
OFFSET
1,2
COMMENTS
Question: Does every term need to be odd? Could there be any other non-multiples of 3 than a(1) and a(3)?
If it exists, a(20) > 2^32.
CROSSREFS
Positions of 1's in A353763. Cf. also A353764.
Conjectured to be a subsequence of A353758.
Sequence in context: A146244 A146457 A051044 * A358584 A003536 A340670
KEYWORD
nonn,more
AUTHOR
Antti Karttunen, May 10 2022
STATUS
approved