279552

Appears in sequences

• a(0) = 0, a(n) = smallest composite k such that phi(k + 2^n) = phi(k) + 2^n; also cototient(k + 2^n) = cototient(k).at n=17A063104
• a(n) = 2^n*(3^n-3).at n=6A066406
• Elements of A103741 that do not terminate in a zero digit.at n=21A103764
• Denominator of the integral of x^n times the Cantor function, from 0 to 1.at n=5A159010
• Numbers k for which A019565(2k)-1 is a multiple of A000265(phi(A019565(2k))).at n=41A339973
• Numbers m such that A034448(A188999(m)) = k*m for some k, where A034448 and A188999 are respectively the unitary and the bi-unitary sigma function.at n=36A369204