22321

Appears in sequences

• Deceptive nonprimes: composite numbers k that divide the repunit R_{k-1}.at n=30A000864
• Pseudoprimes to base 60.at n=38A020188
• Numbers whose base-3 representation has exactly 10 runs.at n=28A043590
• Numbers n such that number of runs in the base 3 representation of n is congruent to 0 mod 10.at n=28A043815
• a(n) = 2*n^4 + 2*n^3 + 3*n^2 + 2*n + 1.at n=10A058920
• Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 11000-01110-00011 pattern in any orientation.at n=11A147192
• 13 times pentagonal numbers: a(n) = 13*n*(3*n-1)/2.at n=34A153793
• Composite numbers n with the property that phi(n) divides (n-1)^2.at n=10A173703
• E.g.f.: Limit_{N->oo} [ Sum_{n>=0} (N + 3*n)^(2*n) * (x/N)^n/n! ]^(1/N).at n=4A266486
• Numbers k for which rank of the elliptic curve y^2=x^3-k*x is 4.at n=17A309034
• Number of partitions of n with exactly nine sorts of part 1 which are introduced in ascending order.at n=3A320822
• a(n) is the number of resistance values R=x/y that can be obtained by a network of at most n one-ohm resistors such that a network of more than n one-ohm resistors is needed to obtain the resistance y/x.at n=4A339547
• Centered icositetrachoral numbers.at n=5A365204