1,1

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,...

Table of n, a(n) for n=1..50.

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).

Cf. A000069, A227930, A131323, A234431.

Sequence in context: A178150 A214784 A205798 * A248398 A052368 A226542

Adjacent sequences: A233385 A233386 A233387 * A233389 A233390 A233391

nonn,easy

Gerasimov Sergey, Dec 08 2013

approved