64881

Appears in sequences

• Ordered factorizations with one level of parentheses indexed by prime signatures. A050354(A025487).at n=38A050355
• Indices of primes in sequence defined by A(0) = 17, A(n) = 10*A(n-1) + 27 for n > 0.at n=19A102034
• Numbers k such that the concatenation of k with 4*k gives a square.at n=10A115535
• a(0)=1, a(1)=1, a(n) = 9*a(n/2) for even n >= 2, and a(n) = 8*a((n-1)/2) + a((n+1)/2) for odd n >= 3.at n=40A116526
• Expansion of g.f. 1/((1-x^2+x^3+x^4-x^5)*(1-x-x^2+x^3-x^5)).at n=31A147598
• Totally multiplicative sequence with a(p) = a(p-1) + 8 for prime p.at n=39A166705
• Numbers D such that D^2 = A^3 + B^4 + C^5 and A^2 + B^3 + C^4 = d^2 for some positive integers A, B, C, d.at n=14A256613
• Numbers k that divide Sum_{j|k} j^(k/j).at n=27A343982