The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A047247 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A047247

Numbers that are congruent to {2, 3, 4, 5} (mod 6).
(history; published version)

#47 by Harvey P. Dale at Sat May 25 14:45:30 EDT 2024

STATUS

editing

approved

#46 by Harvey P. Dale at Sat May 25 14:45:27 EDT 2024

MATHEMATICA

LinearRecurrence[{1, 0, 0, 1, -1}, {2, 3, 4, 5, 8}, 70] (* Harvey P. Dale, May 25 2024 *)

STATUS

approved

editing

#45 by Michael De Vlieger at Sat Feb 10 18:58:15 EST 2024

STATUS

proposed

approved

#44 by Michel Marcus at Sat Feb 10 04:27:16 EST 2024

STATUS

editing

proposed

Discussion

Sat Feb 10

11:42

Antti Karttunen: Same argument as in A047257.

#43 by Michel Marcus at Sat Feb 10 04:27:02 EST 2024

CROSSREFS

Cf. A007623, A047227, A047235, A047246, A047270, A047257.

Discussion

Sat Feb 10

04:27

Michel Marcus: comment should rather be in A276076, A276086 ?

#42 by Michel Marcus at Sat Feb 10 04:26:41 EST 2024

CROSSREFS

Cf. A007623, A047227, A047235, A047246, A047270, A047257, A049345, A276076, A276086.

Cf. A007623, A049345, A276076, A276086.

STATUS

proposed

editing

#41 by Antti Karttunen at Sat Feb 10 03:40:53 EST 2024

STATUS

editing

proposed

#40 by Antti Karttunen at Sat Feb 10 03:40:26 EST 2024

COMMENTS

Numbers k for which A276076(k) and A276086(k) are multiples of three. For a simple proof, consider the second rightmost digits penultimate digit in the factorial and primorial base expansions of n, A007623 and A049345. - Antti Karttunen, Feb 08 2024

STATUS

proposed

editing

#39 by Antti Karttunen at Sat Feb 10 03:35:22 EST 2024

STATUS

editing

proposed

#38 by Antti Karttunen at Sat Feb 10 03:35:13 EST 2024

COMMENTS

Numbers k for which A276076(k) and A276086(k) are multiples of three. For a simple proof, consider the second rightmost digits in the factorial and primorial base expansions of n, A007623 and A049345. - Antti Karttunen, Feb 08 2024

STATUS

proposed

editing