27887

Appears in sequences

• Numbers k such that p-k=p#-k#, where p=nextprime(k), k#=nextprime(square root of k), p#=nextprime(square root of p).at n=4A037210
• Numerators of continued fraction convergents to sqrt(165).at n=7A041304
• a(n) = prime(n)^2 - 2.at n=38A049001
• A Chebyshev T-sequence with Diophantine property.at n=4A078363
• a(1) = 2. For n>1, a(n) = smallest m such that m == 0 (mod prime(n)), m + 1 == 0 (mod prime(n+1)) and m-1 == 0 (mod prime(n-1)).at n=21A078455
• Starting positions of strings of three 4's in the decimal expansion of Pi.at n=20A083615
• a(1)=0, and a(n+1) is the position of first occurrence of a(n) in the decimal expansion of 1/Pi.at n=25A098319
• 2*JacobiSymbol(p,5) mod p^2 for p=prime(n).at n=38A113651
• Number of strings of numbers x(i=1..n) in 0..2 with sum i*x(i) equal to n*2.at n=25A184696
• Collatz-2 (A063041) trajectory starting at 47.at n=6A280707
• a(n) = n^4 + 8*n^3 + 20*n^2 + 16*n + 2.at n=11A304725