The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A246277 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A246277

Column index of n in A246278: a(1) = 0, a(2n) = n, a(2n+1) = a(A064989(2n+1)).
(history; published version)

#76 by Michael De Vlieger at Thu Dec 29 11:19:20 EST 2022

STATUS

proposed

approved

#75 by Gus Wiseman at Thu Dec 29 08:58:01 EST 2022

STATUS

editing

proposed

#74 by Gus Wiseman at Thu Dec 29 08:54:09 EST 2022

FORMULA

If n has prime factorization Product_{i=1..k} prime(x_i), then a(n) = Product_{i=2..k} prime(x_ki-x_1+1). The opposite version is A358195, prime indices A358172, even bisection A241916. - Gus Wiseman, Dec 29 2022

STATUS

proposed

editing

#73 by Gus Wiseman at Thu Dec 29 08:35:25 EST 2022

STATUS

editing

proposed

#72 by Gus Wiseman at Thu Dec 29 08:34:36 EST 2022

CROSSREFS

The sum Sum of prime indices of a(n) is A359358 (n) + A001222 (n) - 1, cf. A326844.

Cf. A005940, `A161511, A241916, `A243503, A253565, A356958, `A358137, A358195.

#71 by Gus Wiseman at Thu Dec 29 06:15:25 EST 2022

CROSSREFS

Cf. A005940, A019565, `A161511, A241916, `A243503, A246277, A253565, A356958, `A358137, A358195.

#70 by Gus Wiseman at Thu Dec 29 06:02:36 EST 2022

FORMULA

If n has prime factorization Product_{i=1..k} prime(x_i), then a(n) = Product_{i=2..k} prime(x_k-x_1+1). The opposite version is A358195, prime indices A358172, even bisection A241916. - Gus Wiseman, Dec 29 2022

CROSSREFS

The sum of prime indices of a(n) is A359358 + A001222 - 1, cf. A326844.

A112798 lists prime indices, length A001222, sum A056239.

Cf. A005940, A019565, A161511, A241916, A243503, A246277, A253565, A356958, A358137, A358195.

STATUS

approved

editing

#69 by Michael De Vlieger at Sun May 22 08:54:08 EDT 2022

STATUS

reviewed

approved

#68 by Joerg Arndt at Sun May 22 05:48:06 EDT 2022

STATUS

proposed

reviewed

#67 by Peter Munn at Sat May 21 09:59:11 EDT 2022

STATUS

editing

proposed