The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A133758 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A133758

Total number of restricted left truncatable primes in base n.
(history; published version)

#15 by Michael De Vlieger at Sun Jun 25 14:03:13 EDT 2023

STATUS

proposed

approved

#14 by Jon E. Schoenfield at Sun Jun 25 13:37:25 EDT 2023

STATUS

editing

proposed

#13 by Jon E. Schoenfield at Sun Jun 25 13:37:00 EDT 2023

COMMENTS

Prime digits p in base n are counted if there is no prime with 2 digits which can have its leftmost digit removed to produce p, ; e. g. , in base 10 the prime digits 2 and 5 are counted, because there are no primes containing them as rightmost digit.

REFERENCES

Steven Kahan; Sol Weintraub: Left truncatable primes. In: Journal of recreational mathematics 29 (1998), ppp. 254-264.

STATUS

approved

editing

#12 by Joerg Arndt at Sun Apr 22 05:09:33 EDT 2018

STATUS

proposed

approved

#11 by Michel Marcus at Sun Apr 22 05:05:24 EDT 2018

STATUS

editing

proposed

#10 by Michel Marcus at Sun Apr 22 05:05:16 EDT 2018

LINKS

Eric Weisstein: 's World of Mathematics, <a href="http://mathworld.wolfram.com/TruncatablePrime.html">Truncatable Prime</a>.

#9 by Michel Marcus at Sun Apr 22 05:04:48 EDT 2018

REFERENCES

Angell, I. O. and Godwin, H. J. "On Truncatable Primes." Math. Comput. 31, 265-267, 1977.

LINKS

<a href="/index/Tri#tprime">Index entries for sequences related to truncatable primes</a>

I. O. Angell and H. J. Godwin, <a href="http://dx.doi.org/10.1090/S0025-5718-1977-0427213-2">On Truncatable Primes</a>, Math. Comput. 31, 265-267, 1977.

<a href="/index/Tri#tprime">Index entries for sequences related to truncatable primes</a>

STATUS

approved

editing

#8 by N. J. A. Sloane at Fri Dec 04 20:47:59 EST 2015

STATUS

editing

approved

#7 by N. J. A. Sloane at Fri Dec 04 20:47:56 EST 2015

LINKS

Chai Wah Wu, <a href="http://arxiv.org/abs/1503.08883">On a conjecture regarding primality of numbers constructed from prepending and appending identical digits</a>, arXiv:1503.08883 [math.NT], 2015.

STATUS

approved

editing

#6 by Russ Cox at Sat Mar 31 10:24:16 EDT 2012

AUTHOR

_Martin Renner (martin.renner(AT)gmx.net), _, Jan 04 2008

Discussion

Sat Mar 31

10:24

OEIS Server: https://oeis.org/edit/global/409