4, 6, 8, 10, 12, 14 129,106 = Keith number 130,321 = 194 131,071 = Mersenne prime 131,072 = 217 131,361 = Leyland number 134,340 = Pluto's minor planet designation 135,137 = Markov number 142,129 = 3772, square number, dodecagonal number 142,857 = Kaprekar number, smallest cyclic number in decimal. 144,000 = number with religious significance 147,640 = Keith number 148,149 = Kaprekar number 152,381 = unique prime in base 20 156,146 = Keith number 160,000 = 204 161,051 = 115 161,280 = highly totient number 166,320 = highly composite number 167,400 = harmonic divisor number 167,894 = number of ways to partition {1,2,3,4,5,6,7,8} and then partition each cell (block) into subcells. 173,600 = harmonic divisor number 174,680 = Keith number 174,763 = Wagstaff prime 177,147 = 311 177,777 = smallest natural number requiring 19 syllables in American English, 21 in British English 178,478 = Leyland number 181,440 = highly totient number 181,819 = Kaprekar number 183,186 = Keith number 183,231 = number of partially ordered set with 9 unlabeled elements 187,110 = Kaprekar number 194,481 = 214 195,025 = Pell number, Markov number 196,418 = Fibonacci number, Markov number 196,560 = the kissing number in 24 dimensions 196,883 = the dimension of the smallest nontrivial irreducible representation of the Monster group 196,884 = the coefficient of q in the Fourier series expansion of the j-invariant. The adjacency of 196883 and 196884 was important in suggesting monstrous moonshine. 199,999 = prime number. 200,000 to 299,999 202,717 = k such that the sum of the squares of the first k primes is divisible by k. 206,098 – Large Schröder number 206,265 = rounded number of arc seconds in a radian (see also parsec), since = 206,264.806... 207,360 = highly totient number 208,012 = the Catalan number C12 208,335 = the largest number to be both triangular and square pyramidal 208,495 = Kaprekar number 212,159 = smallest unprimeable number ending in 1, 3, 7 or 9 221,760 = highly composite number 222,222 = repdigit 227,475 = Riordan number 234,256 = 224 237,510 = harmonic divisor number 238,591 = number of free 13-ominoes 241,920 = highly totient number 242,060 = harmonic divisor number 248,832 = 100,00012, AKA a gross-great-gross (10012 great-grosses);125, the smallest fifth power that can be represented as the sum of only 6 fifth powers: 125 = 45 + 55 + 65 + 75 + 95 + 115 262,144 = 218;