cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

Showing 1-2 of 2 results.

A037094 "Sloping binary representation" of Lucas numbers (A000032), slope = +1.

Original entry on oeis.org

0, 7, 29, 114, 971, 3695, 14684, 58639, 496705, 1892294, 7518347, 30023387, 258775984, 966632223, 3848859285, 32551146626, 123937019667, 492763242871, 1967451434524, 16666715013959, 63494909959113
Offset: 0

Views

Author

Antti Karttunen, Jan 28 1999

Keywords

Examples

			When Lucas numbers (A000032) are written in binary, under each other as:
0000010 (2)
0000001 (1)
0000011 (3)
0000100 (4)
0000111 (7)
0001011 (11)
0010010 (18)
0011101 (29)
0101111 (47)
1001100 (76)
and one starts collecting their bits from column-0 to SW-direction (from the least to the most significant end), one gets 000... (0), ...00111 (7), ...011101 (29), ...001110010 (114), etc. (See A102370 for similar transformation done on nonnegative integers).
		

Crossrefs

Cf. A000032, A037093, A037095, A037099 (same sequence in octal).

Formula

a(n) := Sum(bit_n(A000032(n+i), i)*(2^i), i=0..inf) [ bit_n := (x, n) -> `mod`(floor(x/(2^n)), 2); ]
In practice, 3n (2n?) can be used as an upper limit instead of infinity.

Extensions

Entry revised Dec 29 2007

A037098 Sequence A037093 shown in octal.

Original entry on oeis.org

0, 1, 3, 16, 71, 345, 1624, 17121, 71577, 345342, 1624171, 17121011, 71577060, 345342131, 1624173733, 17331156576, 71473314601, 345325637555, 3624144315044, 16333160460471, 71272765314407
Offset: 0

Views

Author

Antti Karttunen, Jan 29 1999

Keywords

Crossrefs

Compare to A037099.

Formula

a(n) = A007094(A037093(n)).

Extensions

Entry revised Dec 29 2007
Showing 1-2 of 2 results.