195
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Number
$195$ (one hundred and ninety-five) is:
- $3 \times 5 \times 13$
- With $140$, an element of the $2$nd quasiamicable pair:
- $\map {\sigma_1} {140} = \map {\sigma_1} {195} = 336 = 140 + 195 + 1$
- The $9$th inconsummate number after $62$, $63$, $65$, $75$, $84$, $95$, $161$, $173$:
- $\nexists n \in \Z_{>0}: n = 195 \times \map {s_{10} } n$
- The $19$th sphenic number after $30$, $42$, $66$, $70$, $78$, $102$, $105$, $110$, $114$, $130$, $138$, $154$, $165$, $170$, $174$, $182$, $186$, $190$:
- $195 = 3 \times 5 \times 13$
- The $38$th lucky number:
- $1$, $3$, $7$, $9$, $13$, $15$, $21$, $\ldots$, $133$, $135$, $141$, $151$, $159$, $163$, $169$, $171$, $189$, $193$, $195$, $\ldots$
Also see
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