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

1,1

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,...

Links

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

Example

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).

Mathematica

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

Crossrefs

Cf. A000069, A227930, A131323, A234431.

Sequence in context: A178150 A214784 A205798 * A248398 A052368 A226542

Adjacent sequences: A233385 A233386 A233387 * A233389 A233390 A233391

Keyword

nonn,easy

Author

Gerasimov Sergey, Dec 08 2013

Status

approved