0,2

a(7) must be larger than 5*10^41 - pdg.

P. De Geest, List of palindromic triangulars

Cf. A069501.

Sequence in context: A127637 A068665 A050722 this_sequence A023174 A157197 A036286

Adjacent sequences: A069499 A069500 A069501 this_sequence A069503 A069504 A069505

nonn,base,hard

Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Mar 30 2002.

a(6) from Patrick De Geest (pdg(AT)worldofnumbers.com), Jun 11 2003.