104490

Appears in sequences

• Numbers k such that k and 9*k are anagrams.at n=13A023093
• Decagonal numbers divisible by 10.at n=33A117797
• Number of n-digit 7th powers.at n=38A216657
• E.g.f. C(x) satisfies: C(x)^2 + 2*S(x)^2 = 1 such that S'(x) = C(x)^2 - S(x)*C(x) and C'(x) = 2*S(x)^2 - 2*S(x)*C(x), where S(x) is described by A279842.at n=9A279841
• Total sum of the left-to-right maxima in all compositions of n.at n=15A336511