Numbers 170,000s

A page of the Numeropedia - the Special Encyclopedia of Numbers

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170,940

[Math.]  Two consecutive sums of consecutive numbers: 3025+…+3080 = 3081+…+3135 = 170,940.

171,396

[Math.]  171,396 = (17+1+396)2 = 4142.

171,856

[Math.]  A pair of amicable numbers (171856, 176336).

172,081

[Math.]  A Carmichael number: 172,081 = 7×13×31×61.

174,611

[Math.]  The numerator of the 20th Bernoulli number: B20 = 174611/330.

[Math.]  The infinite sum Sn(1/n20) = p20´174611/1531329465290625 = z(20), where n runs over all positive integers and z(s) is the Riemann zeta function over complex variable s.

174,680

[Math.]  The 29th Keith number.

175,560

[Math.]  The order of the 3rd sporadic group: Janko group J1.

176,272

[Math.]  A pair of amicable numbers (176272, 180848).

176,336

[Math.]  A pair of amicable numbers (171856, 176336).

176,460

[Math.]  Two consecutive sums of consecutive square numbers:

1362+1372+…+1432+1442 = 176,460 = 1452+1462+…+1512+1522.

177,776

[Math.]  44,4443 = 87,788,861,480,384 and 8778+88614+80384 = 177,776.

77,7773 = 470,493,429,496,433 and 47049+34294+96433 = 177,776.

177,792

[Math.]  The 2nd known amicable/sociable number chain: 14316 → 19116 → 31704 → 47616 → 83328 → 177792 → 295488 → 629072 → 589786 → 294896 → 358336 → 418904 → 366556 → 274924 → 275444 → 243760 → 376736 → 381028 → 285778 → 152990 → 122410 → 97946 → 48976 → 45946 → 22976 → 22744 → 19916 → 17716 → 14316. (of 28 links, currently the longest, found by Poulet, 1918).

179,487

[Math.]  179,487×4 = 717,948.

179,584

[Geology]  The number of islands that Finland has, the most for a country in the world. There are also approximately 190,000 lakes.