23550

Appears in sequences

• a(0) = 1, a(n) = 28*n^2 + 2 for n>0.at n=29A010018
• a(n) = prime(n)*prime(n+1) - prime(n+1).at n=35A037167
• Minimal (positive) solution a(n) of Pell equation a(n)^2 - D(n)*b(n)^2 = +4 with D(n)= A077425(n). The companion sequence is b(n)=A078355(n).at n=34A077428
• Minimal positive solution a(n) of Pell equation a(n)^2 - D(n)*b(n)^2 = +4 or -4 with D(n)=A077425(n). The companion sequence is b(n)=A077058(n).at n=34A078361
• Number of (n+1) X 2 0..3 arrays with every 2 X 2 subblock having nonzero determinant and commuting with every horizontal or vertical neighbor.at n=11A206336
• Values of k such that F(k)*F(k+1)-1 is a prime, where F(k) is the k-th Fibonacci number (A000045).at n=15A271428
• Triples of practical numbers: numbers n such that n-2, n, n+2 are all practical numbers.at n=27A287682
• 5-tuples of practical numbers: numbers n such that n-6, n-2, n, n+2, n+6 are all practical numbers.at n=10A287683
• Integral area of primitive integer-sided triangles whose sides a < b < c are in arithmetic progression.at n=46A351178
• Number of partitions of n with six designated summands.at n=15A384926