58674

Appears in sequences

• Numbers k such that usigma(k) is a square and sets a new record for such squares.at n=32A064443
• a(n) = Sum_{i=0..n} digsum_8(i)^4, where digsum_8(i) = A053829(i).at n=35A231683
• a(1)=1; for n>1, a(n) is the smallest positive integer for which sigma(a(n)) is a proper multiple of sigma(a(n-1)).at n=16A237352