The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A349162 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A349162

a(n) = sigma(n) / gcd(sigma(n), A003961(n)), where A003961 shifts the prime factorization of n one step towards larger primes, and sigma is the sum of divisors function.
(history; published version)

#27 by Michael De Vlieger at Fri Feb 18 11:10:24 EST 2022

STATUS

proposed

approved

#26 by Antti Karttunen at Fri Feb 18 09:16:24 EST 2022

STATUS

editing

proposed

#25 by Antti Karttunen at Fri Feb 18 09:16:14 EST 2022

CROSSREFS

Cf. also A349745, A351551, A351554.

#24 by Antti Karttunen at Fri Feb 18 09:14:47 EST 2022

STATUS

proposed

editing

#23 by Antti Karttunen at Fri Feb 18 09:14:19 EST 2022

STATUS

editing

proposed

#22 by Antti Karttunen at Wed Feb 16 14:41:08 EST 2022

COMMENTS

Obviously, 1's after a(2) could may occur only on squares & twice squares (A028982). See also comments in A350072. - Antti Karttunen, Feb 16 2022

#21 by Antti Karttunen at Wed Feb 16 14:37:58 EST 2022

COMMENTS

Obviously, 1's after a(2) could occur only on squares & twice squares (A028982). See comments in A350072. - Antti Karttunen, Feb 16 2022

CROSSREFS

Cf. A000203, A003961, A028982 (positions of odd terms), A319630, A336702, A342671, A348992 (the odd part), A348993, A349161 (numerators), A349163, A349164, A349627, A349628, A350072 [= a(n^2)].

STATUS

approved

editing

#20 by N. J. A. Sloane at Sun Nov 28 12:53:48 EST 2021

STATUS

reviewed

approved

#19 by Michel Marcus at Sun Nov 28 04:28:51 EST 2021

STATUS

proposed

reviewed

#18 by Antti Karttunen at Sun Nov 28 04:19:33 EST 2021

STATUS

editing

proposed