A236849 Numbers that occur as results of remultiplication (GF(2)[X] -> N) of some number and have at least one prime divisor encoding a reducible polynomial in ring GF(2)[X].

25, 50, 55, 75, 87, 100, 110, 115, 145, 150, 165, 174, 175, 185, 200, 203, 213, 220, 225, 230, 253, 261, 275, 285, 290, 299, 300, 301, 319, 325, 330, 345, 348, 350, 355, 357, 370, 375, 385, 391, 395, 400, 406, 415, 425, 426, 435, 440, 445, 450, 460, 475, 477, 495, 505, 506, 515, 522, 525, 529, 535, 545, 550, 555

Offset

1,1

Comments

Terms of A236842 (A234742) that are divisible by at least one of the primes in A091209.

a(4)=75, is the first term here which does not occur in A236834. On the other hand, A236834(5)=91 is the first of its terms that does not occur here.

Links

Antti Karttunen, Table of n, a(n) for n = 1..13105

Prog

(Scheme, with Antti Karttunen's IntSeq-library)
(define A236849 (COMPOSE A236842 (MATCHING-POS 1 1 (lambda (n) (any (lambda (p) (= 1 (A091247 p))) (ifactor (A236842 n)))))))

Crossrefs

Setwise difference A236848 \ A236844, and also A236842 \ A236860.

Cf. A091209, A234742, A236842, A236848, A236834.

Sequence in context: A076637 A040600 A277190 * A236834 A033902 A354379

Adjacent sequences: A236846 A236847 A236848 * A236850 A236851 A236852

Keyword

nonn

Author

Antti Karttunen, Jan 31 2014

Status

approved