The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A242378

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A242378

Square array read by antidiagonals: to obtain A(i,j), replace each prime factor prime(k) in prime factorization of j with prime(k+i).
(history; published version)

#33 by Michael De Vlieger at Fri Oct 04 08:51:45 EDT 2024

STATUS

proposed

approved

#32 by Peter Munn at Fri Oct 04 07:50:06 EDT 2024

STATUS

editing

proposed

#31 by Peter Munn at Fri Oct 04 07:13:50 EDT 2024

CROSSREFS

Row 0: A001477, Row 1: A003961 (from 1 onward), Row 2: A045966 A357852 (from 5 1 onward), Row 3: A045968 (from 7 onward), Row 4: A045970 (from 11 onward).

STATUS

approved

editing

Discussion

Fri Oct 04

07:16

Peter Munn: The newer A357852 is a more accurate match to the row.

#30 by Jon E. Schoenfield at Thu Mar 30 22:16:04 EDT 2017

STATUS

editing

approved

#29 by Jon E. Schoenfield at Thu Mar 30 22:15:57 EDT 2017

NAME

Square array read by antidiagonals: to obtain A(i,j), replace each prime factor prime(k) in prime factorization of j by with prime(k+i).

STATUS

approved

editing

#28 by N. J. A. Sloane at Tue Dec 23 00:34:28 EST 2014

STATUS

proposed

approved

#27 by Antti Karttunen at Fri Dec 19 07:35:13 EST 2014

STATUS

editing

proposed

#26 by Antti Karttunen at Fri Dec 19 07:34:41 EST 2014

CROSSREFS

Cf. Permutations whose formulas refer to this array: A122111, A241909, A242415, A242419, A246676, A246678, A246684.

STATUS

proposed

editing

#25 by Antti Karttunen at Fri Dec 19 06:20:31 EST 2014

STATUS

editing

proposed

#24 by Antti Karttunen at Fri Dec 19 06:19:26 EST 2014

CROSSREFS

Taking every second column starting from column 2 onward gives array A246278 which is a permutation of natural numbers larger than 1.