37765

Appears in sequences

• Expansion of (1-x)^2/(1-3*x+2*x^3-x^4).at n=11A052946
• Terms of A050530 with four prime divisors.at n=26A053340
• Numbers k such that the reverse concatenation of the first k integers (A000422(k)) is a prime.at n=1A176024
• a(n) = ((n+2)/2)*Sum_{k=0..n/2} (Sum_{i=0..n-2*k} (binomial(k+1,n-2*k-i)*binomial(k+i,k))*F(k+1)/(k+1)), where F(k) is Fibonacci numbers.at n=14A270737
• 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=39A286359
• Tetraprimes (or products of exactly four distinct prime numbers) that are the sum of two successive tetraprimes.at n=14A380348