21543

Appears in sequences

• Numbers k such that 201*2^k-1 is prime.at n=39A050852
• Numbers with 5 distinct digits {1,2,3,4,5} such that all adjacent digits (as well as first and last digits) are coprime.at n=15A104972
• Number of partitions of n with a product greater than n.at n=37A114324
• Number of partitions of n where odd parts are distinct or repeated once.at n=44A131945
• Numbers n with property that 4 n^2 are squares arising in A158470.at n=39A158517
• Permutations of 12345: Numbers having each of the decimal digits 1,...,5 exactly once, and no other digit.at n=29A178475
• Number of partitions of 4 copies of n into distinct parts.at n=16A258282
• Sum of the 2nd smallest parts of all the partitions of n (2nd smallest part is defined to be 0 when the partition does not have at least 2 distinct parts).at n=30A265248
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 814", based on the 5-celled von Neumann neighborhood.at n=38A273644
• Expansion of chi(-x^4) * psi(x^6) / phi(-x) in powers of x where phi(), psi(), chi() are Ramanujan theta functions.at n=22A279320