228653

Appears in sequences

• Composite numbers m such that m'' = m'-1, where m' and m'' are the first and the second arithmetic derivatives of m.at n=19A189803
• Sum of absolute values of real and imaginary parts of the coefficients in the expansion of 1 / (1 - x - 2*I*x^2), where I^2=-1.at n=21A218138