A230631 a(n) = n + (sum of digits in base-4 representation of n).

0, 2, 4, 6, 5, 7, 9, 11, 10, 12, 14, 16, 15, 17, 19, 21, 17, 19, 21, 23, 22, 24, 26, 28, 27, 29, 31, 33, 32, 34, 36, 38, 34, 36, 38, 40, 39, 41, 43, 45, 44, 46, 48, 50, 49, 51, 53, 55, 51, 53, 55, 57, 56, 58, 60, 62, 61, 63, 65, 67, 66, 68, 70, 72, 65, 67, 69, 71, 70, 72, 74, 76, 75, 77, 79, 81, 80, 82, 84, 86, 82

Offset

0,2

Links

Donovan Johnson, Table of n, a(n) for n = 0..10000

Index entries for Colombian or self numbers and related sequences

Formula

a(n) = A053737(n) + n. - Reinhard Zumkeller, Mar 20 2015

Prog

(Haskell) a230631 n = a053737 n + n  -- Reinhard Zumkeller, Mar 20 2015
(PARI) apply( {A230631(n)=n+sumdigits(n, 4)}, [0..99]) \\ M. F. Hasler, Oct 30 2024

Crossrefs

Cf. A010064 (missing numbers), A230632 (number of inverses), A230633-A230635.

Related base-4 sequences: A053737, A230632, A010064, A230633, A230634, A230635, A230636, A230637, A230638, A010065 (trajectory of 1)

Sequence in context: A254763 A023825 A022485 * A271324 A177961 A353733

Adjacent sequences: A230628 A230629 A230630 * A230632 A230633 A230634

Keyword

nonn,base

Author

N. J. A. Sloane, Oct 30 2013

Status

approved