login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A083678 Numbers n = d_1 d_2 ... d_k (in base 10) with properties that k is even and d_i + d_{k+1-i} = 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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

The two-digit 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+1-i]) ! = 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

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified June 18 06:02 EDT 2021. Contains 345098 sequences. (Running on oeis4.)