90841

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 20.at n=26A031608
• Primes p of the form : p+p^2+p^3-+4=prime.at n=24A154822
• Primes of the form x^2 + 18480*y^2.at n=25A173274
• Number of n X 2 0..3 arrays with no element equal to two plus the sum of elements to its left or two plus the sum of the sum of elements above it, modulo 4.at n=6A238991
• Number of nX7 0..3 arrays with no element equal to two plus the sum of elements to its left or two plus the sum of the sum of elements above it, modulo 4.at n=1A238996
• T(n,k)=Number of nXk 0..3 arrays with no element equal to two plus the sum of elements to its left or two plus the sum of the elements above it, modulo 4.at n=29A238997
• T(n,k)=Number of nXk 0..3 arrays with no element equal to two plus the sum of elements to its left or two plus the sum of the elements above it, modulo 4.at n=34A238997
• Decimal representation of the x-axis, from the origin to the right edge, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 589", based on the 5-celled von Neumann neighborhood.at n=18A283174
• Primes p that set records for the minimum k in the Erdős-Straus y = k*p construction for 4/p = 1/x + 1/y + 1/z.at n=6A392469
• Prime numbersat n=8789