A233388 Odious numbers that are the sum of 2 consecutive odious numbers.

11, 19, 35, 47, 59, 67, 79, 91, 107, 115, 131, 143, 155, 171, 179, 191, 203, 211, 227, 239, 251, 259, 271, 283, 299, 307, 319, 331, 339, 355, 367, 379, 395, 403, 419, 431, 443, 451, 463, 475, 491, 499, 515, 527, 539, 555, 563, 575, 587, 595

Offset: 1

Author

Gerasimov Sergey, Dec 08 2013

Keywords

• nonn
• easy

Comments

Composites in this sequence: 35, 91, 115, 143, 155, 171, 203, 259, 299, 319, 229, 366, 395, 403, 451, 475, 515, 527, 539, 555, 575, 595,...

(a(n + 1) - a(n))/4 are 2, 4, 3, 3, 2, 3, 3, 4, 2, 4, 3, 3, 4, 2, 3, 3, 2, 4, 3, 3, 2, 3, 3, 4, 2, 3, 3, 2, 4, 3, 3, 4, 2, 4, 3, 3, 2, 3,...

Examples

			11 is in this sequence because 11 = A000069(6) and 11 = 4 + 7 where 4 = A000069(3) and 7 = A000069(4).
19 is in this sequence because 19 = A000069(10) and 19 = 8 + 11 where 8 = A000069(5) and 11 = A000069(6).
		

Links

• Amiram Eldar, Table of n, a(n) for n = 1..10000

Crossrefs

Cf. A000069, A227930, A131323, A234431.

Programs

Mathematica

odQ[n_] := OddQ @ DigitCount[n, 2, 1]; Select[Plus @@@ Partition[Select[Range[300] , odQ], 2, 1], odQ] (* Amiram Eldar, Aug 29 2020 *)