A023746 Plaindromes: numbers whose digits in base 4 are in nondecreasing order.

0, 1, 2, 3, 5, 6, 7, 10, 11, 15, 21, 22, 23, 26, 27, 31, 42, 43, 47, 63, 85, 86, 87, 90, 91, 95, 106, 107, 111, 127, 170, 171, 175, 191, 255, 341, 342, 343, 346, 347, 351, 362, 363, 367, 383, 426, 427, 431, 447, 511, 682, 683, 687, 703, 767, 1023, 1365, 1366

Offset: 1

Author

Olivier Gérard

Keywords

• nonn
• base
• easy

Links

• Vincenzo Librandi, Table of n, a(n) for n = 1..500

Programs

Mathematica

Select[Range[0,1366],LessEqual@@IntegerDigits[#,4]&] (* Ray Chandler, Jan 06 2014 *)

Extensions

Offset set to 1 by Ray Chandler, Jan 06 2014