login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 59th year, we have over 358,000 sequences, and we’ve crossed 10,300 citations (which often say “discovered thanks to the OEIS”).

Other ways to Give
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A028386 Numbers k such that k*(3k-1)/2 is a pentagonal palindrome. 4
1, 2, 4, 26, 44, 101, 693, 2173, 2229, 4228, 6010, 26466, 26906, 31926, 44059, 1258723, 1965117, 1979130, 2684561, 13280839, 59401650, 84885761, 100058581, 225563533, 316882086, 700457153, 818049201, 851649306, 1345679688 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

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

P. De Geest, Palindromic Pentagonals

CROSSREFS

Cf. A002069, A000326.

Sequence in context: A218258 A186431 A129894 * A259374 A155120 A356442

Adjacent sequences: A028383 A028384 A028385 * A028387 A028388 A028389

KEYWORD

nonn,base

AUTHOR

Patrick De Geest

EXTENSIONS

More terms from Patrick De Geest, Nov 15 1998

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified December 5 20:26 EST 2022. Contains 358588 sequences. (Running on oeis4.)