59858

Appears in sequences

• Numbers k such that phi(k)^2+sigma(k)^2 is prime.at n=32A068367
• 2*p^2, for p an odd prime.at n=38A143928
• Number of binary strings of length n with no substrings equal to 0001, 0100, or 1011.at n=29A164466
• Numbers the sum of whose even divisors is 2 times a prime.at n=19A195334
• Numbers such that the difference between the sum of the even divisors and the sum of the odd divisors is prime.at n=22A195382
• Composite numbers k such that Sum_{i=1..t-1} d(i+1)/d(i) is prime, where d(1), ..., d(t) are the divisors of k in ascending order.at n=36A255585
• Even numbers such that the sum of the odd divisors is a prime p and the sum of the even divisors is 2p.at n=14A273459
• Where records occur in A070138.at n=40A298942
• a(n) = prime(n)*(prime(n-1) + prime(n+1)).at n=38A357679
• Index of first occurrence of n in A000319, or -1 if n never appears there.at n=20A381230
• G.f. satisfies A(x) = Sum_{n>=1} A(x^3)^n / A(x^(2*n)), with A(0) = 0 and A'(0) = 1.at n=31A383376
• G.f. A(x) satisfies A(x) = 1/(1 - x/(1 - x*A(x)^2)^4).at n=7A391647