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.

Showing 1-3 of 3 results.

A087730 Values of j for A087651 and A087732.

Original entry on oeis.org

2, 1, 2, 3, 1, 2, 5, 6, 2, 5, 1, 4, 5, 11, 6, 9, 10, 11, 13, 14, 8, 17, 11, 4, 11, 16, 19, 20, 22, 27, 16, 22, 4, 23, 24, 37, 28, 14, 23, 36, 11, 11, 15, 53, 64, 20, 75, 83, 91, 35, 72, 80, 48, 47, 2, 12, 30, 38, 54, 60, 108, 173, 13, 173, 164, 69, 121, 36, 170, 204, 285, 247, 105
Offset: 0

Views

Author

Pierre CAMI, Sep 28 2003

Keywords

Examples

			2307*2557#-1 and 2307*2557#+1 are twin primes.

Crossrefs

Cf. A002110, A087651, A086916, A087732.

Extensions

Edited by Jud McCranie and Ray Chandler, Oct 05 2003

A087731 Values of P for A087651.

Original entry on oeis.org

2, 3, 3, 3, 5, 5, 5, 5, 7, 7, 11, 11, 11, 11, 13, 13, 13, 13, 13, 13, 17, 17, 19, 23, 23, 23, 23, 23, 23, 23, 29, 31, 37, 37, 43, 47, 53, 59, 59, 59, 61, 71, 71, 71, 71, 79, 79, 83, 89, 97, 97, 101, 103, 107, 113, 127, 137, 139, 151, 151, 163, 179, 193, 227, 241, 257, 263, 277
Offset: 0

Views

Author

Pierre CAMI, Sep 28 2003

Keywords

Crossrefs

Cf. A000040, A002110, A086916, A087651, A087732, A088676.

Extensions

Edited by Jud McCranie, Oct 06 2003

A086916 Number of digits in terms of A087732.

Original entry on oeis.org

1, 1, 2, 2, 2, 2, 3, 3, 3, 4, 4, 4, 5, 5, 6, 6, 6, 6, 6, 6, 7, 7, 9, 9, 10, 10, 10, 10, 10, 10, 12, 13, 14, 15, 18, 20, 21, 23, 23, 23, 25, 28, 28, 29, 29, 32, 33, 35, 37, 38, 39, 41, 43, 45, 47, 50, 55, 57, 62, 62, 66, 73, 79, 92, 101, 106, 108, 115, 121, 123, 126, 131, 140, 141
Offset: 1

Views

Author

Pierre CAMI, Sep 25 2003

Keywords

Comments

Number of digits of the twin primes of the form j*P(i)# - 1 and j*P(i)# + 1 with 0 < j < P(i+1), P(i)= i rank primes, P(i)# = primorial of P(i) (A002110).

Examples

			a(23)=9 since A087732(23)=106696589 has 9 digits.
a(31)=12 since A087732(31)=103515091679 has 12 digits.

Crossrefs

Cf. A086916, A087651, A087730, A087731, A087732, A088676.

Extensions

Edited by Ray Chandler, Oct 05 2003
Showing 1-3 of 3 results.

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