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 A217562 Even numbers not divisible by 5. 3
 2, 4, 6, 8, 12, 14, 16, 18, 22, 24, 26, 28, 32, 34, 36, 38, 42, 44, 46, 48, 52, 54, 56, 58, 62, 64, 66, 68, 72, 74, 76, 78, 82, 84, 86, 88, 92, 94, 96, 98, 102, 104, 106, 108, 112, 114, 116, 118, 122, 124, 126, 128, 132 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Numbers ending with 2,4,6,8 in base 10. No term is divisible by 10 therefore a subsequence of A067251 (Numbers with no trailing zeros in decimal representation). Union of this sequence with A005408 (The odd numbers) gives A067251. Union of this sequence with A045572 (Numbers that are odd but not divisible by 5) gives A047201. The even numbers divisible by 5 are A008592 (Multiples of 10). LINKS Jeremy Gardiner, Table of n, a(n) for n = 1..4000 Index entries for linear recurrences with constant coefficients, signature (1,0,0,1,-1). FORMULA a(n) = 2*A047201(n). G.f.: 2*x*(1+x+x^2+x^3+x^4) / ( (1+x)*(1+x^2)*(x-1)^2 ). - R. J. Mathar, Oct 06 2012 MATHEMATICA CoefficientList[Series[2*(1 + x + x^2 + x^3 + x^4)/((1 + x)*(1 + x^2)*(x - 1)^2), {x, 0, 100}], x] (* Vincenzo Librandi, Dec 28 2012 *) PROG (BASIC) for n=1 to 199 if n mod 5 <> 0 and n mod 2 <> 1 then print str\$(n)+", "; next n print (PARI) A217562(n)=(n-1)*5\2+2 \\ - M. F. Hasler, Oct 07 2012 (Magma) I:=[2, 4, 6, 8, 12]; [n le 5 select I[n] else Self(n-1) + Self(n-4) - Self(n-5): n in [1..60]]; // Vincenzo Librandi, Dec 28 2012 CROSSREFS Cf. A005408, A005843, A045572, A047201, A067251. Sequence in context: A058817 A328593 A254748 * A088879 A316470 A290822 Adjacent sequences: A217559 A217560 A217561 * A217563 A217564 A217565 KEYWORD nonn,easy AUTHOR Jeremy Gardiner, Oct 06 2012 STATUS approved

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Last modified April 23 07:34 EDT 2024. Contains 371905 sequences. (Running on oeis4.)