A397093 Nonnegative numbers with palindromic canonical snowball representation.

0, 1, 3, 7, 9, 11, 13, 25, 27, 41, 43, 49, 57, 81, 97, 105, 111, 127, 131, 157, 161, 191, 193, 219, 243, 259, 345, 379, 385, 395, 411, 435, 469, 495, 499, 511, 601, 641, 729, 769, 803, 867, 935, 949, 963, 981, 1015, 1029, 1135, 1187, 1257, 1335, 1405, 1537

Offset

1,3

Comments

See A397794 for the definition of the canonical snowball representation of a number.

Links

Rémy Sigrist, Table of n, a(n) for n = 1..10000

Rémy Sigrist, PARI program

Example

The first terms, alongside their canonical snowball representation, are:
  n   a(n)  snowball(a(n))
  --  ----  --------------
   1     0
   2     1               1
   3     3              11
   4     7             101
   5     9             111
   6    11             121
   7    13            1001
   8    25           10001
   9    27            1111
  10    41            1221
  11    43           10101
  12    49          100001
  13    57           11011
  14    81           11111
  15    97         1000001

Prog

(PARI) \\ See Links section.

Crossrefs

Cf. A046807, A397794.

Sequence in context: A027897 A027892 A158938 * A047529 A359567 A125667

Adjacent sequences: A397090 A397091 A397092 * A397094 A397096 A397097

Keyword

nonn,base,new

Author

Rémy Sigrist, Jul 14 2026

Status

approved