166617

Appears in sequences

• Number of subsets of {1,2,...,n} whose sum is semiprime (cf. A001358, A064911).at n=18A181522
• Smallest number expressible in the form a^2 + 2b^2, with positive integers a and b, in exactly n ways.at n=14A200977
• a(n) is the smallest nonnegative integer k where there are exactly n nonnegative integer solutions to x^2 + 2*y^2 = k.at n=15A374285
• a(n) is the smallest positive integer k such that A002325(k) = n.at n=29A374294
• Numbers x such that there exist three integers 0<x<=y<=z and t>0 such that sigma(x)^2 = sigma(y)^2 = sigma(z)^2 = x^2 + y^2 + z^2 + t^2.at n=42A385531
• Integers x such that sigma(x)^2 - 3*x^2 is a square.at n=17A385810