20459

Appears in sequences

• Coordination sequence for sigma-CrFe, Position Xd.at n=36A009959
• Sum{T(n-k,k)}, 0<=k<=[ n/2 ], T given by A026907.at n=13A026918
• Composite and every divisor (except 1) contains the digit 4.at n=12A062670
• The 4k+3 integers corresponding to the record positions in A165601.at n=41A166046
• Number of nX4 binary arrays with every 1 immediately preceded by 0 0 to the left or above.at n=5A203104
• Number of nX6 binary arrays with every 1 immediately preceded by 0 0 to the left or above.at n=3A203106
• T(n,k)=Number of nXk binary arrays with every 1 immediately preceded by 0 0 to the left or above.at n=39A203108
• T(n,k)=Number of nXk binary arrays with every 1 immediately preceded by 0 0 to the left or above.at n=41A203108
• G.f.: 1/(1 - x^2/(1 - x^3/(1 - x^5/(1 - x^7/(1 - x^11/(1 - ... - x^prime(k)/(1 - ... ))))))), a continued fraction.at n=36A285407
• Numbers k such that the Reverse and Add! trajectory of k (presumably) does not reach a palindrome and does not join the trajectory or one of the reverse numbers of the trajectory of any term m < k.at n=42A306232
• a(n) is the sum of the terms of the symmetric square array defined by M(i,j) = prime(i)+i-j for i >= j and M(i,j) = M(j,i) if i < j.at n=19A308731