login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A073692 Odd numbers a(n) such that product(a(n-1),a(n-1)+2,...,a(n)-2) plus 2 is prime. 2
1, 3, 5, 7, 15, 17, 19, 23, 27, 29, 31, 41, 43, 49, 69, 71, 73, 77, 79, 87, 89, 93, 97, 113, 119, 123, 127, 139, 145, 149, 151, 175, 179, 181, 187, 195, 197, 199, 213, 221, 223, 227, 229, 233, 245, 251, 263, 267, 269, 271, 285, 323, 375, 385, 389, 395, 397, 559 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..57.

MATHEMATICA

t = {}; s = 1; c = 0; Do[s = s*i; c += 1; If[PrimeQ[s + 2], AppendTo[t, i - 2*(c - 1)]; s = 1; c = 0], {i, 1, 570, 2}]; t (* Jayanta Basu, Jul 07 2013 *)

PROG

(PARI) print1("1, "):p=1:c=3:for(n=1, 80, while(!isprime(p+2), p=p*c:c=c+2):print1(c", "):p=c:c=c+2)

CROSSREFS

Cf. A073691, A073693.

Sequence in context: A227685 A051445 A002181 * A132012 A160690 A085494

Adjacent sequences:  A073689 A073690 A073691 * A073693 A073694 A073695

KEYWORD

nonn

AUTHOR

Amarnath Murthy, Aug 12 2002

EXTENSIONS

Edited by Ralf Stephan, Mar 26 2003

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Superseeker | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .

Last modified October 20 18:46 EDT 2014. Contains 248371 sequences.