cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

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A129944 Left truncatable primes in base 8 (written in decimal form).

Original entry on oeis.org

2, 3, 5, 7, 11, 13, 19, 23, 29, 31, 37, 43, 47, 53, 59, 61, 83, 101, 107, 139
Offset: 1

Views

Author

Martin Renner, Jun 09 2007

Keywords

Comments

There are a total number of 446 left truncatable primes in base 8. Last term is a(446) = 14005650767869.

Links

Crossrefs

Cf. A024783, A076623.

A129945 Left truncatable primes in base 9 (written in decimal form).

Original entry on oeis.org

2, 3, 5, 7, 11, 23, 29, 41, 43, 47, 59, 61, 79, 173, 191, 223, 241, 347, 353, 367, 383, 509, 547, 659, 677, 691, 709, 727, 1699, 1811, 3089, 3299, 3463, 3593, 3607, 3643, 4547, 4597, 4721, 5051, 5101, 6073, 6199, 6379, 6491, 14821, 16421, 16729, 17669, 18223
Offset: 1

Views

Author

Martin Renner, Jun 09 2007

Keywords

Comments

There are a total number of 108 left truncatable primes in base 9.

Links

Crossrefs

Cf. A024784, A076623.

A133758 Total number of restricted left truncatable primes in base n.

Original entry on oeis.org

0, 3, 5, 4, 149, 7, 144, 37, 1442
Offset: 2

Views

Author

Martin Renner, Jan 04 2008

Keywords

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), pp. 254-264.

Links

Crossrefs

Cf. A076623, A055521.
Previous Showing 11-13 of 13 results.

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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