A076641 Integers read backwards, but with repetitions omitted.

0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 21, 31, 41, 51, 61, 71, 81, 91, 12, 22, 32, 42, 52, 62, 72, 82, 92, 13, 23, 33, 43, 53, 63, 73, 83, 93, 14, 24, 34, 44, 54, 64, 74, 84, 94, 15, 25, 35, 45, 55, 65, 75, 85, 95, 16, 26, 36, 46, 56, 66, 76, 86, 96, 17, 27, 37, 47, 57, 67, 77, 87, 97

Offset

0,3

Comments

Although this is a list, it seems most natural here to have offset 0. - N. J. A. Sloane, Dec 09 2020

Links

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

Dana G. Korssjoen, Biyao Li, Stefan Steinerberger, Raghavendra Tripathi, and Ruimin Zhang, Finding structure in sequences of real numbers via graph theory: a problem list, arXiv:2012.04625, Dec 08, 2020

Example

10 backwards is 01=1, but 1 already appears, so omit it.

Maple

s := (L::list)->sum(L[i]*10^(nops(L)-i), i=1..nops(L)); d := (X::posint)->convert(X, base, 10); SD := K->[seq(s(d(k)), k=1..K)];

Prog

(Haskell)
a076641 = a004086 . a067251  -- Reinhard Zumkeller, Aug 12 2013

Crossrefs

Cf. A004086.

Sequence in context: A354081 A096106 A321990 * A076643 A352463 A326402

Adjacent sequences: A076638 A076639 A076640 * A076642 A076643 A076644

Keyword

easy,nonn,base

Author

Francois Jooste (phukraut(AT)hotmail.com), Oct 23 2002

Extensions

a(0) = 0 added by N. J. A. Sloane, Dec 09 2020

Status

approved