

A083678


Numbers n = d_1 d_2 ... d_k (in base 10) with properties that k is even and d_i + d_{k+1i} = 10 for all i.


2



19, 28, 37, 46, 55, 64, 73, 82, 91, 1199, 1289, 1379, 1469, 1559, 1649, 1739, 1829, 1919, 2198, 2288, 2378, 2468, 2558, 2648, 2738, 2828, 2918, 3197, 3287, 3377, 3467, 3557, 3647, 3737, 3827, 3917, 4196, 4286, 4376, 4466, 4556, 4646, 4736, 4826, 4916
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OFFSET

1,1


COMMENTS

The twodigit terms here occur in many sequences, e.g. A066686, A081926, A017173, A030108, A043457, A052224, A061388, A084364.


LINKS

Table of n, a(n) for n=1..45.


EXAMPLE

1469 and 6284 are members because 1+9=4+6=10 and 6+4=2+8=10.


PROG

(PARI) isok(n) = {digs = digits(n); if (#digs % 2 == 0, for (i = 1, #digs/2, if ((digs[i] + digs[#digs+1i]) ! = 10, return (0)); ); return (1); ); return (0); } \\ Michel Marcus, Oct 05 2013


CROSSREFS

Cf. A066686, A081926, A017173, A030108, A043457, A052224, A061388, A084364.
Sequence in context: A052224 A179955 A243994 * A279771 A257043 A120144
Adjacent sequences: A083675 A083676 A083677 * A083679 A083680 A083681


KEYWORD

easy,nonn,base


AUTHOR

Zak Seidov Jun 15 2003


STATUS

approved



