0,2

Eric Weisstein's World of Mathematics, Pentagonal Pyramidal Number

Cf. A002411, A014799, A015224, A014800.

Sequence in context: A158742 A158765 A055561 this_sequence A129625 A133382 A017791

Adjacent sequences: A015220 A015221 A015222 this_sequence A015224 A015225 A015226

nonn,easy

Mohammad K. Azarian (ma3(AT)evansville.edu)

More terms from Erich Friedman (erich.friedman(AT)stetson.edu).