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A333421
Primes that are palindromic in factorial base.
3
3, 7, 11, 41, 127, 139, 173, 179, 191, 751, 811, 5113, 5167, 5419, 5443, 6581, 6659, 6737, 6761, 6833, 6863, 6911, 6959, 40609, 40897, 41047, 41479, 42061, 42349, 42499, 42643, 42787, 50549, 51131, 51419, 51563, 52289, 52433, 52583, 52727, 363361, 363481, 365473
OFFSET
1,1
EXAMPLE
3 is a term since it is a prime number and its factorial base representation is 11 which is a palindrome.
MATHEMATICA
max = 9; Select[Range[0, max! - 1], PrimeQ[#] && PalindromeQ @ IntegerDigits[#, MixedRadix[Range[max, 2, -1]]] &]
KEYWORD
nonn
AUTHOR
Amiram Eldar, Mar 20 2020
STATUS
approved