1,1

None of the digits can be 0,4,6,8 or 9. All the digits must be 1 or, just one digit can be 2,3,5 or 7 and all the others are 1.

There are no more terms less than 10^2580. - Hans Havermann (pxp(AT)rogers.com), May 07 2006

1711 is in the sequence because (1)it is a triangular number and (2)the product of its digits is 1*7*1*1=7, which is a prime number.

Cf. A000217.

Sequence in context: A147017 A076825 A118565 this_sequence A087674 A009057 A083795

Adjacent sequences: A117798 A117799 A117800 this_sequence A117802 A117803 A117804

more,nonn,base

Luc Stevens (lms022(AT)yahoo.com), Apr 29 2006