In Mathematics
131 is a Sophie Germain prime, the second 3-digit palindromic prime, and also a permutable prime with 113 and 311. It can be expressed as the sum of three consecutive primes, 131 = 41 + 43 + 47. 131 is an Eisenstein prime with no imaginary part and real part of the form . Because the next odd number, 133, is a semiprime, 131 is a Chen prime.
131 is a full reptend prime in base 10. The decimal expansion of 1/131 repeats the digits 00763358778625954198473282442748091603053435114503816793893129770992366412213 74045801526717557251908396946564885496183206106870229 indefinitely.
Read more about this topic: 131 (number)
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