52769

Properties

Appears in sequences

• a(n) = [ a(n-1)/a(1) ] + [ a(n-2)/a(2) ] + ... + [ a(1)/a(n-1) ], for n >= 3.at n=20A022858
• Number of proper factorizations of p1^n*p2^2, where p1 and p2 are distinct primes.at n=27A031125
• Records in A079375.at n=9A079376
• Primes from merging of 5 successive digits in decimal expansion of (Pi^2).at n=14A104928
• Sum of largest parts of all partitions of n into an odd number of parts.at n=33A222047
• Number of n X 3 0,1 arrays indicating 2 X 2 subblocks of some larger (n+1) X 4 binary array having determinant equal to one, with rows and columns of the latter in nondecreasing lexicographic order.at n=10A227638
• Number of n-digit primes whose sum of digits is 7.at n=40A259144
• Prime numbersat n=5387