66912

Appears in sequences

• Expansion of e.g.f. sin(x)/cos(sin(x)) (odd powers only).at n=5A009553
• Unitary superperfect numbers: numbers n such that usigma(usigma(n)) = 2*n, where usigma(n) is the sum of unitary divisors of n (A034448).at n=11A038843
• A strong divisibility sequence associated with the algebraic integer 2 + i.at n=79A230369
• Numbers m such that A049417(A049417(m)) = k*m for some k where A049417 is the infinitary sigma function.at n=21A318182
• Numbers n for which A324108(n) = A324054(n-1) and which are neither prime powers nor of the form 2^i * p^j, where p is an odd prime, with either exponent i or j > 0.at n=21A324111
• Positive numbers whose square starts and ends with exactly 44, and no 444.at n=31A348831