644098

Appears in sequences

• Expansion of series_reversion( x/(1 + sum(k>=1, x^A032766(k)) ) ) / x.at n=15A215340
• a(n) is the sum of all integers of the form k^2 + 1 whose greatest prime factor is A002313(n), the n-th prime not congruent to 3 mod 4.at n=9A379347