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 1-2 of 2 results.

A137242 Numbers n such that A116127(n) = 2.

Original entry on oeis.org

4, 6, 8, 9, 11, 12, 14, 15, 16, 18, 19, 21, 22, 23, 24, 25, 27, 29, 31, 32, 36, 37, 38, 39, 40, 44, 48, 50, 51, 54, 55, 56, 58, 59, 63, 65, 67, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 84, 85, 86, 87, 88, 90, 92, 93, 94, 95, 96, 100, 102, 103, 105, 107, 108, 110, 111, 112, 117
Offset: 1

Views

Author

Giovanni Teofilatto, Mar 09 2008

Keywords

Comments

See also A049579 for a(n) = n iff A116127(n) = 2n with n>0.

Crossrefs

Cf. A049579, A116127.

Extensions

Corrected (71 inserted) by R. J. Mathar, Apr 22 2010

A086801 a(n) = prime(n) - 3.

Original entry on oeis.org

-1, 0, 2, 4, 8, 10, 14, 16, 20, 26, 28, 34, 38, 40, 44, 50, 56, 58, 64, 68, 70, 76, 80, 86, 94, 98, 100, 104, 106, 110, 124, 128, 134, 136, 146, 148, 154, 160, 164, 170, 176, 178, 188, 190, 194, 196, 208, 220, 224, 226, 230, 236, 238, 248, 254, 260, 266, 268, 274, 278
Offset: 1

Views

Author

Giovanni Teofilatto, Aug 05 2003

Keywords

Comments

Numbers n such that n+3 is a prime.

Examples

			n=16 is here because 16+3=19 is a prime.

References

  • M. Cerasoli, F. Eugeni and M. Protasi, Elementi di Matematica Discreta, Bologna 1988
  • Emanuele Munarini and Norma Zagaglia Salvi, Matematica Discreta, UTET, CittaStudiEdizioni, Milano 1997

Crossrefs

Cf. A006254, A067076, A091738, A116127, A119981, A173064.

Programs

Formula

a(n) = 2*A067076(n) = 2*(A006254(n+1)-2).

Extensions

Extended by Ray Chandler, Nov 29 2003
Showing 1-2 of 2 results.

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