A115772 - OEIS

A115772

Integers i such that 13*i = A048720bi(21,i).

0, 5, 10, 15, 20, 21, 30, 31, 40, 42, 45, 47, 60, 61, 62, 63, 80, 84, 85, 90, 94, 95, 120, 122, 124, 125, 126, 127, 160, 165, 168, 170, 173, 175, 180, 181, 188, 189, 190, 191, 240, 244, 245, 248, 250, 252, 253, 254, 255, 320, 330, 336, 340, 341, 346, 350, 351

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OFFSET

0,2

COMMENTS

Here * stands for ordinary multiplication and A048720 is the carryless (GF(2)[X]) multiplication.

a(n) appears to be the set of all n that can be expressed as x OR 4x for the bitwise OR operation. [From Gary Detlefs Dec 20 2010]

LINKS

Table of n, a(n) for n=0..56.

Index entries for sequences defined by congruent products between domains N and GF(2)[X]

CROSSREFS

Row 13 of A115872. Cf. A048717, A115767, A115770. Superset of A115774 ? A115776 gives the terms which are not in A115774. A115773 shows this sequence in binary.

Cf. A178891

Sequence in context: A190240 A199860 A101889 * A178891 A044890 A313717

Adjacent sequences: A115769 A115770 A115771 * A115773 A115774 A115775

KEYWORD

nonn

AUTHOR

Antti Karttunen, Jan 30 2006

STATUS

approved