A046807 Palindromes in factorial base.

0, 1, 3, 7, 9, 11, 25, 33, 41, 121, 127, 133, 139, 147, 153, 159, 165, 173, 179, 185, 191, 721, 751, 781, 811, 843, 873, 903, 933, 965, 995, 1025, 1055, 5041, 5065, 5089, 5113, 5137, 5167, 5191, 5215, 5239, 5263, 5293, 5317, 5341, 5365, 5389, 5419, 5443, 5467

Offset

1,3

Comments

Equivalently numbers n such that row n of A108731 is symmetric. - Rémy Sigrist, Mar 20 2018

Links

Rémy Sigrist, Table of n, a(n) for n = 1..1000

Index entries for sequences related to factorial base representation

Index entries for sequences related to palindromes

Example

41 = 1 4! + 2 3! + 2 2! + 1 1!.

Prog

(PARI) is(n) = my (d=[]); for (r=2, oo, if (n==0, return (Vecrev(d)==d), d=concat(n%r, d); n\=r)) \\ Rémy Sigrist, Mar 19 2018

Crossrefs

Cf. A108731.

Sequence in context: A003538 A018596 A191181 * A333423 A178836 A338712

Adjacent sequences: A046804 A046805 A046806 * A046808 A046809 A046810

Keyword

base,nonn

Author

Erich Friedman

Extensions

More terms from Floor van Lamoen, Oct 31 2001

Data corrected and initial 0 added by Rémy Sigrist, Mar 19 2018

Status

approved