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OEIS Record

Uninteresting Numbers (latest)

An uninteresting number is a positive integer that does not appear in any OEIS sequence. As of July 2009, 11630 was the first such number.

20990, 23543, 23735, 24085, 24159, 24555, 26301, 26673, 26708, 27266, 27815, 27988, 28330, 28353, 28869, 28946, 29577, 29962, 30131, 30146, 30193, 30328, 30466, 30473, 30541, 30714, 30878, 30907, 31017, 31364, 31479, 31534, 31562, 31566, 31717, 31773, 31955, 32492, 32729, 32854, 32962, 32996, 33070, 33453, 33618, 33638, 33690, 33735, 33842, 33927
Updated: 2026-06-20 19:04:39 JST
Count: 50

Reference: math.crg4.com/uninteresting.html (archived 2018)

Sloane's Gap

Popular vs Unpopular Numbers

Prime numbers tend to appear in significantly more OEIS sequences than composite numbers.

Sloane's Gap

Note: Number of sequences is computed following the definition of N(n) in "Sloane's Gap" (Gauvrit et al., arXiv:1101.4470) — "the number of times n appears in the number file" — using per-sequence deduplication: each sequence contributes at most 1 to N(n), regardless of how many times n appears within it. This interpretation is supported by the observation that the value range in Figure 1 of the paper does not exceed the total number of sequences.