

A344545


Lexicographically earliest sequence S of distinct nonnegative terms such that the sum of the last k digits of S is even, k being the leftmost digit of a(n).


0



0, 2, 20, 4, 6, 21, 3, 8, 22, 5, 7, 40, 9, 30, 23, 31, 50, 24, 25, 32, 26, 27, 33, 51, 70, 28, 29, 34, 35, 41, 36, 37, 42, 60, 43, 38, 39, 44, 61, 52, 45, 71, 53, 72, 46, 47, 54, 48, 49, 55, 56, 57, 58, 59, 62, 63, 64, 73, 74, 75, 65, 300, 66, 80, 67, 76, 68, 69, 90, 81, 77, 91, 78, 79, 82, 83, 301, 302, 84
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OFFSET

1,2


LINKS

Table of n, a(n) for n=1..79.


EXAMPLE

a(1) = 0, k = 0, and the sum 0 is even;
a(2) = 2, k = 2, and the sum 0 + 2 (= 2) is even;
a(3) = 20, k = 2, and the sum 2 + 2 (= 4) is even;
a(4) = 4, k = 4, and the sum 2 + 2 + 0 + 4 (= 8) is even;
a(5) = 6, k = 6, and the sum 0 + 2 + 2 + 0 + 4 + 6 (= 14) is even;
a(6) = 21, k = 2, and the sum 6 + 2 (= 8) is even; etc.


CROSSREFS

Cf. A344540.
Sequence in context: A342077 A077339 A077341 * A076495 A308387 A058403
Adjacent sequences: A344542 A344543 A344544 * A344546 A344547 A344548


KEYWORD

nonn,base


AUTHOR

Eric Angelini and Carole Dubois, May 30 2021


STATUS

approved



