# 71

This number is a prime.

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Jeffery Marshall © 2002 |

*p*such that

*p*=

^{4}*q*+

^{3}*r*is soluble in positive integers : 71

^{2}^{4}= 136

^{3}+ 4785

^{2}. [Beedassy]

Having varied widely over the decades and constantly being
narrowed, the Hubble's constant *H*_{0} (a measure of
the Universe's observed expansion rate) current best
estimates revolve around 71 km/s/Mpc (kilometers per second
for each megaparsec or about 3.3 million light years away
from the Earth). [Beedassy]

The smallest emirp whose binary reversal (1110001_{2}) corresponds to another emirp (113). [Beedassy]

The smallest emirp *p* which taken together with the
*p*th prime is also an emirp (71353). [Beedassy]

The first occurrence of three successive emirps in the sequence of primes: 71, 73, 79. [Beedassy]

(There are 2 curios for this number that have not yet been approved by an editor.)

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