

A256087


Nonpalindromic balanced numbers in base 7.


1



364, 420, 476, 492, 532, 548, 604, 640, 660, 708, 728, 764, 820, 836, 876, 892, 948, 984, 1004, 1052, 1072, 1108, 1164, 1180, 1220, 1236, 1292, 1328, 1348, 1396, 1416, 1452, 1508, 1524, 1564, 1580, 1636, 1672, 1692, 1740, 1760, 1796, 1852, 1868, 1908, 1924, 1980
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OFFSET

1,1


COMMENTS

Here a number is called balanced if the sum of digits weighted by their arithmetic distance from the "center" is zero. Since palindromes (A029954) are trivially balanced, they are excluded here.
This is the base7 variant of the decimal version A256075 invented by Eric Angelini. See there, and the base2 version A256082, for further information and examples.


LINKS

Table of n, a(n) for n=1..47.


PROG

(PARI) is(n, b=7, d=digits(n, b), o=(#d+1)/2)=!(vector(#d, i, io)*d~)&&d!=Vecrev(d)


CROSSREFS

Cf. A256082  A256089, A256075, A256080, A029954.
Sequence in context: A098251 A115464 A004534 * A260837 A272359 A023697
Adjacent sequences: A256084 A256085 A256086 * A256088 A256089 A256090


KEYWORD

nonn,base


AUTHOR

M. F. Hasler, Mar 14 2015


STATUS

approved



