1234 is the natural number following 1233, and preceding 1235. It has two distinct prime factors, 2 and 617, making it a squarefree semiprime.[1] It is the number of independent vertex sets in a 4×4 square grid, or equivalently, the number of distinct 4×4 binary matrices in which no two adjacent elements are both equal to 1.[2]
| ||||
|---|---|---|---|---|
| Cardinal | one thousand two hundred thirty-four | |||
| Ordinal | 1234th (one thousand two hundred thirty-fourth) | |||
| Factorization | 2 × 617 | |||
| Greek numeral | ,ΑΣΛΔ´ | |||
| Roman numeral | MCCXXXIV | |||
| Binary | 100110100102 | |||
| Ternary | 12002013 | |||
| Senary | 54146 | |||
| Octal | 23228 | |||
| Duodecimal | 86A12 | |||
| Hexadecimal | 4D216 | |||
A 2012 study of frequently-used personal identification numbers (PIN) found that, among 4-digit PIN codes, 1234 is the most frequently chosen.[3]
References
edit- ^ Sloane, N. J. A. (ed.). "Sequence A001358". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
- ^ Sloane, N. J. A. (ed.). "Sequence A006506". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
- ^ Berry, N. (September 3, 2012). "PIN analysis". Data Genetics. As cited by Nisbet, Alastair; Kim, Maria (December 2016). "An analysis of chosen alarm code pin numbers & their weakness against a modified brute force attack". In Johnstone, M. (ed.). The Proceedings of 14th Australian Information Security Management Conference. Perth, Australia: Edith Cowan University. pp. 21–29. doi:10.4225/75/58a69fd2a8b03.
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