Bilangan prima palindromik adalah bilangan prima yang terlihat sama ketika angkanya dibaca secara terbalik dari arah belakang (seperti halnya, angka prima 929 dan 16561), yang mana bilangan ini memiliki sifat simetris reflektif pada sumbu vertikal. Contoh dari bilangan prima palindromik pertama (dalam bilangan desimal) adalah:
Bilangan prima palindromik mempunyai jumlah tak terhingga, karena dengan bilangan basis 10, barisan bilangan ini dapat diciptakan seperti halnya yang berkaitan dengan bilangan berbasis fungsi Smarandache[1], sebagai salah satu di antaranya [2], dll.[butuh sumber yang lebih baik] Sejauh ini bilangan prima palindromik yang terbesar adalah
101888529 - 10944264 - 1.
yang terdiri dari 1,888,529 digit, dan ditemukan pada 18 Oktober 2021 oleh Ryan Propper dan Serge Batalov.[3]
^See Caldwell, Prime Curios! (CreateSpace, 2009) p. 251, quoted in Wilkinson, Alec (February 2, 2015). "The Pursuit of Beauty". The New Yorker. Diakses tanggal July 2, 2022.
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