A093472 - OEIS

A093472

(2n+1)-digit anti-palindromic numbers or numberdromes, whose first and last digits add to ten, second and next-to-last add to ten and so on with the central digit a 5.

159, 258, 357, 456, 555, 654, 753, 852, 951, 11599, 12589, 13579, 14569, 15559, 16549, 17539, 18529, 19519, 21598, 22588, 23578, 24568, 25558, 26548, 27538, 28528, 29518, 31597, 32587, 33577, 34567, 35557, 36547, 37537, 38527, 39517

(list; graph; refs; listen; history; text; internal format)

OFFSET

0,1

LINKS

Table of n, a(n) for n=0..35.

FORMULA

a(n) = (10^(m+1))n+5(10^m)+(10^m-n)

EXAMPLE

a(1) = 159 because at least three digits are required, so that n = 1, m = 1 yields a(1) = 100+50+(10-1) = 159

CROSSREFS

Cf. A083678.

Sequence in context: A045260 A280967 A192173 * A270304 A281665 A329535

Adjacent sequences: A093469 A093470 A093471 * A093473 A093474 A093475

KEYWORD

easy,nonn,base

AUTHOR

Michael Joseph Halm, May 13 2004

STATUS

approved