21165
domain: N
Appears in sequences
- Conjecturally, largest attractor in '3x+(2n+1)' problem.at n=43A039515
- List of codewords in binary lexicode with Hamming distance 7 written as decimal numbers.at n=20A075937
- Odd composite numbers k such that cototient(k) - phi(k) = k - 2*phi(k) is an odd prime.at n=8A083255
- Indices k where A057176(k) = 4.at n=23A086838
- Number of Motzkin n-paths with an even number of up steps.at n=13A107587
- Large-number statistic from the enumeration of domino tilings of a 9-pillow of order n.at n=17A112843
- Odd n such that 2*phi(n) < n, but there does not exist an even k < n with phi(k) = phi(n).at n=3A118700
- Concatenation of n-th prime and n-th nonprime.at n=46A253910
- Rhonda numbers in vigesimal number system.at n=3A255732
- Denominator of (1/3)*n*(n + 2)/((1 + 2*n)*(3 + 2*n)).at n=41A300295
- Number of cyclic patterns of length n that avoid the vincular pattern 23-1-4.at n=11A346660
- Expansion of (1/x) * Series_Reversion( x * (1-x) * (1-x+x^5) ).at n=7A368937