A089217 n-2 is a prime of the form 4*k+3.

5, 9, 13, 21, 25, 33, 45, 49, 61, 69, 73, 81, 85, 105, 109, 129, 133, 141, 153, 165, 169, 181, 193, 201, 213, 225, 229, 241, 253, 265, 273, 285, 309, 313, 333, 349, 361, 369, 381, 385, 421, 433, 441, 445, 465, 469, 481, 489, 493, 501, 505, 525, 549, 565, 573

Offset

1,1

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.

Links

Table of n, a(n) for n=1..55.

Formula

a(n) = A087915(n)+ A089193(n)

Mathematica

Select[4*Range[0, 200]+3, PrimeQ]+2 (* Harvey P. Dale, Jun 04 2017 *)

Crossrefs

Cf. A087915, A089193.

Sequence in context: A259568 A057961 A314792 * A166049 A334214 A053411

Adjacent sequences: A089214 A089215 A089216 * A089218 A089219 A089220

Keyword

easy,nonn

Author

Giovanni Teofilatto, Dec 10 2003

Extensions

Offset corrected by Arkadiusz Wesolowski, Aug 09 2011

Corrected and extended by Harvey P. Dale, Jun 04 2017

Status

approved