1,2

Conjecture: sequence is finite.

No more terms < 166890000. - David Wasserman, Apr 19 2005

Table of n, a(n) for n=1..9.

a(4) = 23 as 1*2*6+1, 2*6*23+1, 1*6*23+1 and 1*2*23+1 (i.e. 13, 277, 139 and 47) all are primes.

Sequence in context: A177253 A020122 A327426 * A213324 A007672 A322255

Adjacent sequences: A086551 A086552 A086553 * A086555 A086556 A086557

nonn

Amarnath Murthy, Aug 29 2003

Corrected and extended by David Wasserman, Apr 19 2005

approved