54049

Properties

Appears in sequences

• Numbers k such that the continued fraction for sqrt(k) has odd period and if the last term of the periodic part is deleted the two central terms are both 30.at n=8A031618
• Primes of the form prime(n)^2 - prime(n+1) - 1.at n=21A097938
• Median of the largest prime dividing the first 10^n numbers greater than 1.at n=7A126282
• Number of n X 3 binary arrays without the pattern 0 0 diagonally or vertically.at n=7A188700
• Number of 8Xn binary arrays without the pattern 0 0 diagonally or vertically.at n=2A188712
• a(n) is the smallest prime such that it and the previous two primes are all of the form x^2 + n * y^2.at n=20A212603
• Number of n element 0..3 arrays with each element the minimum of 7 adjacent elements of a random 0..3 array of n+6 elements.at n=13A217953
• Number of times when an odd number is encountered, when going from 2^(n+1)-1 to (2^n)-1 using the iterative process described in A071542.at n=20A218543
• Number of nX3 0..1 arrays with every element equal to 0, 3, 4, 5, 7 or 8 king-move adjacent elements, with upper left element zero.at n=14A299576
• Prime numbersat n=5505