# Titanic Prime whose Digits are all Odd/Historical Note

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## Historical Note on Titanic Prime whose Digits are all Odd

According to David Wells in his *Curious and Interesting Numbers, 2nd ed.* of $1997$, this titanic prime was discovered by Harvey Dubner in $1988$, but this has not been corroborated.

He also reports that it is the largest known prime whose digits are odd.

This was likely the case in $1997$, but research is needed to see if this record has since been superseded.

## Sources

- 1997: David Wells:
*Curious and Interesting Numbers*(2nd ed.) ... (previous) ... (next): $1358 \times 10^{3821} - 1$