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Thabit prime
Named after
Thābit ibn Qurra
Conjectured no. of terms
Infinite
Subsequence of
Thabit numbers
First terms
2, 5, 11, 23, 47, 95, 191, 383, 6143, 786431
OEIS index
A007505
In number theory, a Thabit number, Thâbit ibn Qurra number, or 321 number is an integer of the form for a non-negative integer n.
The 9th century mathematician, physician, astronomer and translator Thābit ibn Qurra is credited as the first to study these numbers and their relation to amicable numbers.[1]
^Rashed, Roshdi (1994). The development of Arabic mathematics: between arithmetic and algebra. Vol. 156. Dordrecht, Boston, London: Kluwer Academic Publishers. p. 277. ISBN 0-7923-2565-6.
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