

A073692


Odd numbers a(n) such that product(a(n1),a(n1)+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



