194399

Appears in sequences

• a(n) = -a(n-1) - 2*a(n-2).at n=37A001607
• Numerators of continued fraction convergents to sqrt(213).at n=11A041396
• Numerators of continued fraction convergents to sqrt(852).at n=7A042644
• Nonprime numbers k such that (k+1)*Sum_{d|k} 1/(d+1) is an integer.at n=25A069155
• a(n) is the unique odd positive solution x of 2^n = 7x^2+y^2.at n=36A077020
• Expansion of (1 + 2*x)/(1 + 3*x + 4*x^2).at n=18A087168
• Lucas and Lehmer numbers with parameters (1 +- sqrt(-7))/2.at n=37A107920
• a(n) = 4*n^3 - 6*n^2 + 1.at n=37A141530
• Row sums of the Riordan array (1-4x+4x^2, x(1-2x)) (A167431).at n=34A167433
• Number of (n+1)X(n+1) -7..7 symmetric matrices with every 2X2 subblock having sum zero and one, two or three distinct values.at n=9A211445
• Expansion of (2 + x + x^2 + x^3 - x^4 - 2*x^5 - 4*x^6 - 8*x^7) / (1 - x^4 + 16*x^8) in powers of x.at n=37A247487
• a(n) = 3*a(n-1) - 4*a(n-2) with a(0) = a(1) = 1.at n=18A247560
• a(n) = 3*a(n-2) - 4*a(n-4) with a(0) = 2, a(1) = 1, a(2) = 3, a(3) = 1.at n=37A247564
• Numbers k such that the sum of decimal digits of k is the sum of primes dividing k+1 (with repetition).at n=42A339805