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Prime Curios!: 181 (292 words) |
 | 181, a pal-prime, is the sum of the digits of the first 23 primes (2,..., 83). |
| The 181-digit palindromic number made up of all 7s except for the center nut being 181 (7777...7718177...77777) is a palindromic prime with a palindromic prime decimal length. |
| Note that 181 is also the smallest such that at least one of the digits is composite. |
| U.S. Highway 181 - Wikipedia, the free encyclopedia (304 words) |
| US 181 begins in Corpus Christi, Texas at mile marker 0 to the south, through south-central Texas to just south of San Antonio to the north (mile marker 131), for a total length of 211 km. |
| As of 2004, the highway's northern terminus is at an intersection with Interstate 37 a mile (1.6 km) south of San Antonio, Texas' Interstate 410 loop, about 12 miles (19 km) northwest of Floresville. |
| Prior to the Interstate era, US 181 traveled into downtown San Antonio along Presa St. (parts of which are now Texas State Spur 122) to an intersection with its parent route, US 81. |
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