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> it's not contained in any known integer sequence

I think this makes it interesting!

Ah yes, the good old https://en.wikipedia.org/wiki/Interesting_number_paradox

Then your standard is too low.

And I mean that objectively. That standard would not allow an uninteresting number.

Of course it's contained in known integer sequences. The positive integers in increasing order, for example: https://oeis.org/A000027. The search doesn't know about every term in every sequence, as most are infinite and many are mostly unknown (some well-defined sequences only have a few known terms).

2 * 2 * 191 * 383

Which is mildly interesting.

Neat indeed.

3 * 2 ^ {0, 0, 6, 7} - 1

And all of them are palindromes.

For people confused by the above notation:

2 = 3 × 2⁰ − 1

191 = 3 × 2⁶ − 1

383 = 3 × 2⁷ − 1