Frumtæl
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In rīmcræftum, frumtæl oþþe prīmtæl is tæl þæt hæfþ eallrihte twa positife dǣleras: 1 and hit. An tæl þæt nis frumtæl hēt man composit tæl, nymðe þæt tæl 1, þæt is nāhwæðer frum ne composit tæl.
Frumtælscipe is se nama for sēo wyrdnes tō bēonde frumtæl. Frumtalu habbaþ dēoplic weorþ in rīmcræfte.
Sēo æfterfylgung þǣm frumtalum onginnþ:
- 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97, 101, 103, 107, 109, 113
For þæt hord eallum frumtalum man wrīt ℙ, blackboard bold P.
In hringlār, sum dǣl þǣm smǣte algebran, þæt word "frumlic lim" hæfþ syndrige andgiet. Hēr sum hringlim a is frumtæl gif, gif a dǣlþ bc mid b and c hringleomu, þā a dǣlþ c oþþe c. Mid þes andgiet, se additif forlim sum frumtale is ēac frumtæl. For þǣm þe, gif man besēo hord integerum Z swā hringe, −7 is frumtæl.
