22878

Appears in sequences

• Numbers k such that 7*2^k + 3 is prime.at n=19A058592
• Number of partitions of n into parts but with two kinds of parts of sizes 1 to 8.at n=20A103927
• Number of binary strings of length n with no substrings equal to 0101, 0110, or 1001.at n=19A164508
• Number of -n..n arrays x(0..3) of 4 elements with zero sum, adjacent elements differing by more than one, and elements alternately increasing and decreasing.at n=21A200193
• Expansion of series_reversion( x/(1 + sum(k>=1, x^A032766(k)) ) ) / x.at n=12A215340
• Number of permutations of [n] having a shortest ascending run of length 7.at n=9A228674
• Number of involutions avoiding 3421.at n=12A230555
• Triples of practical numbers: numbers n such that n-2, n, n+2 are all practical numbers.at n=25A287682
• Number of integer partitions of n whose negated run-lengths are not unimodal.at n=41A332639
• Numbers k such that lambda(k) = lambda(k+2), where lambda is the Carmichael lambda function (A002322).at n=29A333742
• Smallest positive number divisible by n that has n letters in US English, or 0 if none exists.at n=38A384131