The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A246755 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A246755

Numbers of the form 2k - 1 such that A246702(k) = 3.
(history; published version)

#27 by Michel Marcus at Fri May 15 02:26:03 EDT 2020

STATUS

reviewed

approved

#26 by Joerg Arndt at Fri May 15 02:15:55 EDT 2020

STATUS

proposed

reviewed

#25 by Jinyuan Wang at Fri May 15 01:49:08 EDT 2020

STATUS

editing

proposed

#24 by Jinyuan Wang at Fri May 15 01:48:56 EDT 2020

PROG

(PARI) is(k) = (m=Mod(k%2, k*k)) && sum(i=1, k*k-1, m*=2; m==1) == 3; \\ Jinyuan Wang, May 15 2020

STATUS

proposed

editing

#23 by Jinyuan Wang at Fri May 15 01:34:45 EDT 2020

STATUS

editing

proposed

Discussion

Fri May 15

01:37

Michel Marcus: can you add pari program for here (since you assembled it)

#22 by Jinyuan Wang at Fri May 15 01:33:34 EDT 2020

COMMENTS

Composites in this sequence: 15, 33, 45, 69, 75, 87, 99, 135, 141, 159, 177, 207, 213, 225, 249, 261, 297, 303, 321, 363, 375, 393, 399, 405, 423, 447, 477, ...

EXTENSIONS

More terms from _and terms corrected by _Jinyuan Wang_, May 15 2020

Discussion

Fri May 15

01:34

Jinyuan Wang: using pari in A246702, it's easy to check the incorrect terms

#21 by Jinyuan Wang at Fri May 15 01:31:19 EDT 2020

DATA

15, 33, 43, 45, 69, 75, 87, 99, 109, 135, 141, 157, 159, 177, 207, 213, 225, 229, 249, 261, 277, 283, 297, 303, 307, 321, 363, 375, 393, 399, 405, 423, 447, 477, 479, 499, 501, 519, 531, 537, 573, 591, 621, 639, 643, 675, 681, 691, 717, 733, 739, 747, 783, 789, 807, 811

CROSSREFS

Cf. Numbers of the form 2n 2k - 1 such that A246702(nk) = m: number 1 (m = 0), A167791 (m = 1), A246717 (m = 2), this sequence (m = 3), A001133 (primes in this sequence).

KEYWORD

nonn,more

nonn

EXTENSIONS

More terms from Jinyuan Wang, May 15 2020

STATUS

approved

editing

#20 by Wolfdieter Lang at Tue Nov 25 15:47:55 EST 2014

STATUS

proposed

approved

#19 by Wolfdieter Lang at Tue Nov 25 15:47:42 EST 2014

STATUS

editing

proposed

#18 by Wolfdieter Lang at Tue Nov 25 15:47:17 EST 2014

NAME

Numbers of the form 2n 2k - 1 such that A246702(nk) = 3.

COMMENTS

Composetes Composites in a(n)this sequence: 15, 33, 45, 69, 75, 87, 99, 135, 141, 159, 177, 207, 213, 225, 249, 261, 297, 303, 321, 363, 375, 393, 399, 405, 477, ...

EXAMPLE

A246702(8) = 3 for the first time, hence a(1) = 2*8 - 1 = 15.

STATUS

proposed

editing