22021

Appears in sequences

• Numbers k such that (k*(k+1)*(k+2)) / (k+(k+1)+(k+2)) is a palindrome.at n=15A032789
• a(n) = (2*n+1)*(12*n+1).at n=30A033576
• Primes of form 4k+3 written in base 3.at n=25A072805
• Starts for strings of at least five consecutive nonsquarefree numbers.at n=11A078144
• Partial sum of centered tetrahedral numbers A005894.at n=18A132366
• Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 0100-1100-0111-0001 pattern in any orientation.at n=16A147265
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, 0, -1), (0, -1, 1), (0, 1, 0), (1, -1, -1)}.at n=12A148009
• Primitive numbers in A158235.at n=25A158245
• Last term where no prime sums occur in A161190 in a 4-diagonal set of 24 terms.at n=12A161193
• a(n)=prime(n) written in base the largest digit of prime(n).at n=47A166710
• Templates for lunar primes in any base (version 1).at n=12A171750
• a(n) = 61*n^2.at n=19A174333
• Number of length n binary words that have at least one maximal run of 1's having length two.at n=14A177795
• 2*A197072(n-1) - A197072(n).at n=21A197100
• a(n) is the smallest m such that m! > exp(n*m); or where the mean of the logs of the first m integers exceeds n.at n=9A245285
• Numbers that require three steps to collapse to a single digit in base 4 (written in base 4).at n=15A253953
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 65", based on the 5-celled von Neumann neighborhood.at n=32A270085
• Iterations at which Langton's Ant living on triangular tiling reaches the distance of n from the origin for the first time.at n=40A275303
• Number of nX3 0..1 arrays with every element equal to 1, 2, 4, 5 or 6 king-move adjacent elements, with upper left element zero.at n=10A298391
• Numbers k such that k, k+2, k+4 are of the form p^2*q where p and q are distinct primes.at n=3A308735