77090

Appears in sequences

• Numbers which are the sum of two squared primes in exactly four ways (ignoring order).at n=23A226599
• a(n) = (A278399(n)^2 + A278400(n)^2)/2.at n=43A278420
• Expansion of Sum_{i>=1} mu(i)^2*x^i/(1 - x^i) * Product_{j=1..i} 1/(1 - mu(j)^2*x^j), where mu() is the Moebius function (A008683).at n=53A284835