1981891

Properties

Appears in sequences

• a(n) = a(n-1) + a(n-2) with a(0)=2, a(1)=5. Sometimes called the Evangelist Sequence.at n=28A001060
• a(n) = F(n+1) + L(n), where F(n) and L(n) are Fibonacci and Lucas numbers, respectively.at n=29A013655
• Palindromic primes with middle digit 1.at n=22A082436
• Palindromic primes whose digital root equals their middle digits.at n=26A082518
• Expansion of (7-2*x) / (1-3*x+x^2).at n=13A100545
• Primes that are the difference of two Fibonacci numbers; primes in A007298.at n=38A113188
• a(n) is the sum of all n-digit Fibonacci numbers.at n=5A128823
• Primes in A128823.at n=1A130023
• Primes that are the sum of five consecutive Fibonacci numbers.at n=7A153892
• Lesser prime factor of successively better golden semiprimes.at n=23A165571
• Largest prime factor of A174562(n).at n=56A176195
• y-values in the solution to x^2 - 20*y^2 = 176.at n=29A228208
• 2nd-largest term in n-th row of Stern's diatomic triangle A002487.at n=29A244472
• Happy palindromic primes.at n=32A364479
• Prime numbersat n=147666