195 (number)

195 (number)

195 is the natural number following 194 and preceding 196.

195 is a sphenic number, coming in the middle of the prime quadruplet 191, 193, 197 and 199. 195 is the sum of eleven consecutive primes (3 + 5 + 7 + 11 + 13 + 17 + 19 + 23 + 29 + 31 + 37). Although not itself prime, 195 passes through Ulam's sieve and thus is a lucky number. The smallest number that can be expressed as a sum of distinct squares in 16 different ways is 195 OEIS|id=A097563. 195 is a Harshad number.


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