1,1

Prime indices of palindromic triangular numbers.

P. De Geest, Subsets of palindromic triangulars

Cf. A008510, A050722.

Sequence in context: A117699 A065378 A079853 this_sequence A058114 A042337 A061482

Adjacent sequences: A050718 A050719 A050720 this_sequence A050722 A050723 A050724

nonn,base,hard

Patrick De Geest (pdg(AT)worldofnumbers.com), Sep 15 1999.