1511
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Number
$1511$ (one thousand, five hundred and eleven) is:
- The $240$th prime number.
- The $21$st balanced prime after $5$, $53$, $157$, $173$, $211$, $257$, $263$, $373$, $563$, $593$, $607$, $653$, $733$, $947$, $977$, $1103$, $1123$, $1187$, $1223$, $1367$:
- $1511 = \dfrac {1499 + 1523} 2$
- The $51$st Sophie Germain prime after $2$, $3$, $5$, $11$, $23$, $29$, $41$, $\ldots$, $1031$, $1049$, $1103$, $1223$, $1229$, $1289$, $1409$, $1439$, $1451$, $1481$, $1499$:
- $2 \times 1511 + 1 = 3023$, which is prime.
- The $51$st near-repdigit prime after $101$, $113$, $131$, $151$, $\ldots$, $877$, $881$, $883$, $887$, $911$, $919$, $929$, $977$, $991$, $997$, $1117$, $1171$, $1181$
Also see
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