Belphegors Prime
From charlesreid1
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Mathematical Constants
Irrational Numbers: Euler-Mascheroni Constant · Sqrt2 · Phi · Sqrt3 · e · Sqrt5 · Sqrt6 · Sqrt7 · Sqrt8 · Pi · Sqrt10 · Pi to the Pi Prime Numbers: Prime Numbers · Palindromic Primes · Prime Generating Polynomials · Belphegors Prime Sequences: Fibonacci Numbers · Lucas Numbers · General Fibonacci Numbers Number Forms: Fermat Numbers · Mersenne Primes · Counting and Combinatorics: Catalan Numbers · Shannon Number · Eddington Number Tetration and Knuth's Up Notation: Tetration Factoring and Number Theory: Divisibility · Totient Function Games: Four Fours · Five Fives
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Belphegor's Prime is a palindromic prime with a 666 surrounded by 13 0's and a 1 on each side.
Link with ref: http://sprott.physics.wisc.edu/pickover/pc/1000000000000066600000000000001.html