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 Jan19 comment how many numbers from 1 to 1000 are not divided by 3,4,5? 1000/5=200, 1000/4=250, 1000/3=333, 1000-(200+250+333)=217, add 1000/(3*4)=83, 1000/(3*5)=66, 1000/(4*5)=50, 1000/(3*4*5)=16, 217+83+66+50+16=432, my answer is 432 Dec15 awarded Supporter Dec15 comment Get the last two digits of $16^{100}$ and $17^{100}$ Brute force method, alpertron.com.ar/BIGCALC.HTM 17^100 ends in(07), 16^100 ends in(76) Dec10 comment A store is selling 5 types of hard candies. How many ways are there to chose? Would (35^5)-1 be correct? This sounds like homework. Dec10 comment UPC code proof help If the sum of odd position digits remain the same the check digit will remain the same. This is also true for even position digits. An example would be two odd position digits of 1&9 total (10) could be replaced with 2&8, 3&7, 4&6, 5&5, 6&4, 7&3, 8&2, 9&1. If the sum remains constant the check digit will also remain constant. Odd & Even position digits can be changed, but it gets a little more involved. Also UPC's have a leading (Zero) that is not displayed in the human readables. So if the smaller digit on the left reads 3 it is really a 03. Nov17 comment I need to find possible values of latitude and longitude around a geometric position( with known distance ) Convert distance to angle. (Latx2, Lonx2), (Latx4, Lonx4) are on the same longitude as (Lat1, Lon1), add/subtract the distance angle. Nov16 comment Calculator algorithms Long ago Random numbers were latched from a CPU's dynamic refresh register and manipulated to whatever range was needed. Sep29 comment Is a prime number still a prime when in a different base? Sorry for such an abrupt answer. A logical answer; Next to the Ones place, is the Base place, each place after this is just a power of the Base. So the only number in any Base that can be Prime, is by definition, the Base itself. Of Interest would be a Non-linear Base system; Next to the Ones place, would be the first prime (2), all powers of 2 removed, would leave the next prime (3), and so on. Like a sieve program eliminating all powers of each Base. Each place becomes waited, by its own Base. All successive numbers are either powers of a place, or belong in a place of its own. Sep22 awarded Teacher Sep18 awarded Autobiographer Sep18 answered Is a prime number still a prime when in a different base?