133042

Appears in sequences

• Self-convolution of A004148 (the RNA secondary structure numbers) with itself.at n=15A089735
• Number of (n+2)X(1+2) 0..3 arrays with every 3X3 subblock row and column sum equal to 0 1 3 6 or 7 and every 3X3 diagonal and antidiagonal sum not equal to 0 1 3 6 or 7.at n=11A252185
• Abundant numbers whose abundance is a perfect number.at n=11A301859
• Subsequence of A071395. The extra constraint is m is not a term if m*q/p is abundant where prime p|m and q is the least prime larger than p.at n=14A333967
• Primitive nondeficient numbers satisfying a stronger condition that compares abundancy with related numbers as detailed in the comments.at n=40A352739
• Primitive unitary abundant numbers k (A302573) whose unitary abundancy index usigma(k)/k has a record low value.at n=7A362054
• a(n) is the least number k such that there is a set of n proper divisors of k whose sum is k, and no set of fewer than n proper divisors of k whose sum is k.at n=25A389712
• Numbers m with abundance 28: sigma(m) - 2*m = 28.at n=4A392383