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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
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
Sequence in context: A058817 A328593 A254748 * A088879 A316470 A290822
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.)