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 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. 3
 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 Harvey P. Dale, Table of n, a(n) for n = 1..819 (* All terms through 999999. *) EXAMPLE 1469 and 6284 are members because 1+9=4+6=10 and 6+4=2+8=10. MATHEMATICA ok10Q[n_]:=Module[{idn=IntegerDigits[n]}, idn[[1]]+idn[[4]]==idn[[2]]+idn[[3]]==10]; Join[ Select[ Range[10, 99], Total[IntegerDigits[#]]==10&], Select[Range[1000, 9999], ok10Q]] (* Harvey P. Dale, Oct 14 2023 *) 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 A369341 Adjacent sequences: A083675 A083676 A083677 * A083679 A083680 A083681 KEYWORD easy,nonn,base AUTHOR Zak Seidov Jun 15 2003 STATUS approved

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Last modified July 19 22:34 EDT 2024. Contains 374441 sequences. (Running on oeis4.)