57350

Appears in sequences

• Numbers k such that the sum of the squares of the divisors of k is divisible by k.at n=39A046762
• a(n) = 2^(n-1)*(6*n-10)+6.at n=11A048499
• The number of binary sequences of length n for which all patterns {0,1},{0,0},{1,0},{1,1} appear for the first time. In particular, three of the patterns will have appeared at least once before the (n-1)st digit in the sequence and the remaining pattern appears for the first and only time at positions {n-1,n} in the sequence.at n=19A364685