1,1

Table of n, a(n) for n=1..15.

49 is a term in the sequence because 49 is an odd composite, 49+9+1=59 and 49+21+1=71, are both primes.

Sequence in context: A173391 A259243 A241747 * A160414 A256530 A118130

Adjacent sequences: A133759 A133760 A133761 * A133763 A133764 A133765

more,nonn

Randy L. Ekl, Jan 01 2008

3 more terms from Donovan Johnson, Mar 06 2008

approved