18642

Appears in sequences

• Integers i > 1 for which there is no prime p such that i is a solution mod p of x^4 = 2.at n=34A065903
• Coordination sequence for D_13 lattice.at n=2A107508
• Numbers which converge to 2592 under repeated application of the powertrain map of A133500.at n=15A135384
• Triangle T, read by rows, where column k of T = column 0 of matrix power T^(k+1) for k>0, with column 0 of T = column 1 of T^2 (shifted).at n=30A152406
• Column 2 of triangle A152406; also, column 0 of matrix cube of A152406.at n=5A152409
• Number of length 1+2 0..n arrays with no three consecutive terms having the sum of any two elements equal to twice the third.at n=25A248462
• Number of integers m in [0..10^n-1] such that m has no digit in common with the last n digits of either m^2 or m^3.at n=11A256714
• a(1) = 1; a(n) = 1 + a(n-1) + Sum_{k=2..n} a(floor(n/k)).at n=39A351621
• Squarefree composite numbers m such that k - m^2 < m, where k is the smallest number greater than m^2 such that rad(k) | m.at n=27A362003