1901728

Appears in sequences

• Primitive weird numbers: weird numbers with no proper weird divisors.at n=27A002975
• Weird numbers m such that the sum of their divisors below A033880(m) is greater than A033880(m) = abundance of m.at n=11A100696
• Number of -3..3 arrays x(i) of n+1 elements i=1..n+1 with set{t,u,v in 0,1}((x[i+t]+x[j+u]+x[k+v])*(-1)^(t+u+v)) having three, four, five, six or seven distinct values for every i,j,k<=n.at n=9A211744
• Primitive weird numbers of the form 2^k*p*q with k > 0 and where p < q are odd primes.at n=17A258882
• Primitive weird numbers whose abundance is a record.at n=8A265726
• Least primitive weird number, pwn, (A002975) whose abundance is divisible by the n-th prime (A000040), or 0 if no such pwn exists.at n=8A265728
• Weird numbers k such that k-1 is the sum of a subset of the aliquot divisors of k.at n=8A354281