A054971 n(5n-3)/2 is a palindromic heptagonal number.

1, 2, 5, 16, 38, 44, 156, 583, 1359, 1470, 1556, 53537, 158476, 161656, 171657, 190914, 371778, 382173, 615769, 1207698, 1686537, 16943262, 88274141, 496329416, 765609041, 1820198063, 2497949426, 2850685772, 15911875336

Offset

1,2

Links

Table of n, a(n) for n=1..29.

P. De Geest, Palindromic Heptagonals

Crossrefs

Cf. A054910, A000566.

Sequence in context: A305876 A082085 A179992 * A124720 A188947 A076958

Adjacent sequences: A054968 A054969 A054970 * A054972 A054973 A054974

Keyword

nonn,base

Author

Jeff Heleen, May 26 2000

Status

approved