A270671 Every even-ranked term is bigger than the two terms that surround it AND every even-ranked digit is bigger than the two digits that surround it. This is the lexicographically first such infinite sequence.

1, 3, 2, 5, 4, 7, 6, 9, 8, 90, 10, 21, 20, 31, 30, 40, 32, 42, 41, 50, 43, 52, 51, 54, 53, 61, 60, 63, 62, 65, 64, 71, 70, 73, 72, 75, 74, 80, 76, 82, 81, 84, 83, 86, 85, 91, 87, 93, 92, 95, 94, 97, 96, 702, 12, 14, 13, 16, 15, 18, 17, 23, 19, 25, 24, 27, 26, 29, 28, 35, 34, 37, 36, 39, 38, 46, 45, 48, 47, 56, 49, 58, 57, 67, 59, 69, 68, 79, 78, 120, 98, 902, 121, 202, 130, 203, 131, 204, 132, 302, 140, 205, 141, 206, 142, 303

Offset

1,2

Links

Table of n, a(n) for n=1..106.

Example

Terms: 3 is bigger than 1 and 2; 5 is bigger than 2 and 4; 7 is bigger than 4 and 6; 9 is bigger than 6 and 8; 90 is bigger than 8 and 10; 21 is bigger than 10 and 20; etc.
Digits: 3 is bigger than 1 and 2; 5 is bigger than 2 and 4; 7 is bigger than 4 and 6; 9 is bigger than 6 and 8; 9 is bigger than 8 and 0; 1 is bigger than 0 and 0; etc.

Crossrefs

Sequence in context: A152208 A370429 A282650 * A282664 A085230 A093715

Adjacent sequences: A270668 A270669 A270670 * A270672 A270673 A270674

Keyword

nonn,base

Author

Eric Angelini and Jean-Marc Falcoz, Mar 21 2016

Status

approved