A004093 Even numbers written backwards.

0, 2, 4, 6, 8, 1, 21, 41, 61, 81, 2, 22, 42, 62, 82, 3, 23, 43, 63, 83, 4, 24, 44, 64, 84, 5, 25, 45, 65, 85, 6, 26, 46, 66, 86, 7, 27, 47, 67, 87, 8, 28, 48, 68, 88, 9, 29, 49, 69, 89, 1, 201, 401, 601, 801, 11, 211, 411, 611, 811, 21, 221, 421, 621, 821, 31

Offset

0,2

Links

Reinhard Zumkeller, Table of n, a(n) for n = 0..10000

Formula

a(n) = A004086(2*n). - Reinhard Zumkeller, Feb 09 2012

Prog

(Haskell)
a004093 = a004086 . (* 2)  -- Reinhard Zumkeller, Feb 09 2012
(PARI) a(n) = fromdigits(Vecrev(digits(2*n))); \\ Michel Marcus, Nov 14 2022
(Python)
def a(n): return int(str(2*n)[::-1])
print([a(n) for n in range(66)]) # Michael S. Branicky, Nov 14 2022

Crossrefs

Cf. A004086.

Sequence in context: A169910 A004519 A036839 * A106202 A351330 A220102

Adjacent sequences: A004090 A004091 A004092 * A004094 A004095 A004096

Keyword

nonn,base,look

Author

N. J. A. Sloane

Status

approved