22177
domain: N
Appears in sequences
- Let A(n) = #{(i,j): i^2 + j^2 <= n}, V(n) = Pi*n, P(n) = A(n) - V(n); sequence gives values of n where |P(n)| sets a new record.at n=43A000099
- Crystal ball sequence for hexagonal close-packing.at n=18A007202
- Strong pseudoprimes to base 13.at n=11A020239
- Strong pseudoprimes to base 32.at n=30A020258
- Strong pseudoprimes to base 34.at n=15A020260
- Strong pseudoprimes to base 38.at n=20A020264
- Strong pseudoprimes to base 48.at n=20A020274
- Strong pseudoprimes to base 51.at n=16A020277
- Strong pseudoprimes to base 57.at n=17A020283
- Strong pseudoprimes to base 61.at n=11A020287
- Strong pseudoprimes to base 72.at n=15A020298
- Strong pseudoprimes to base 88.at n=15A020314
- Strong pseudoprimes to base 89.at n=18A020315
- Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 100 ones.at n=13A031868
- a(n) = (2*n+1)*(10*n+1).at n=33A033574
- Number of partitions of n into parts not of the form 17k, 17k+5 or 17k-5. Also number of partitions with at most 4 parts of size 1 and differences between parts at distance 7 are greater than 1.at n=40A035966
- Numbers whose base-3 representation has exactly 10 runs.at n=12A043590
- Numbers n such that number of runs in the base 3 representation of n is congruent to 1 mod 9.at n=30A043807
- Numbers n such that number of runs in the base 3 representation of n is congruent to 0 mod 10.at n=12A043815
- a(n) = prime(n) * prime(prime(n)).at n=18A073065