47069

Appears in sequences

• a(n) = 28*n^2 + 1.at n=41A158556
• Numbers k where k^2 is an anagram of (k+2)^2.at n=18A261749
• Compound filter: a(n) = P(sigma(n), sigma(2n)), where P(n,k) is sequence A000027 used as a pairing function, and sigma is the sum of divisors (A000203).at n=51A286359
• Expansion of 1/(1 - x*(1 + theta_3(x))/2), where theta_3() is the Jacobi theta function.at n=21A302018