The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A272044

(Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
Showing entries 1-10 | older changes

A272044

Numbers n such that n and n^2+1 have the same number of prime factors (including multiplicities).
(history; published version)

#17 by Bruno Berselli at Wed Apr 20 06:24:57 EDT 2016

STATUS

reviewed

approved

#16 by Giovanni Resta at Wed Apr 20 05:18:07 EDT 2016

STATUS

proposed

reviewed

#15 by Michel Marcus at Wed Apr 20 05:04:15 EDT 2016

STATUS

editing

proposed

#14 by Michel Marcus at Wed Apr 20 05:04:04 EDT 2016

CROSSREFS

Cf. A001222 (bigomega), A193330.

STATUS

proposed

editing

#13 by Wesley Ivan Hurt at Tue Apr 19 22:35:38 EDT 2016

STATUS

editing

proposed

#12 by Wesley Ivan Hurt at Tue Apr 19 22:34:50 EDT 2016

MAPLE

with(numtheory): A272044:=n->`if`(bigomega(n)=bigomega(n^2+1), n, NULL): seq(A272044(n), n=1..500); # Wesley Ivan Hurt, Apr 19 2016

CROSSREFS

Cf. A001222 (bigomega).

STATUS

proposed

editing

#11 by Michael De Vlieger at Tue Apr 19 22:13:22 EDT 2016

STATUS

editing

proposed

#10 by Michael De Vlieger at Tue Apr 19 22:13:19 EDT 2016

MATHEMATICA

Select[Range@ 300, PrimeOmega[#^2 + 1] == PrimeOmega@ # &] (* Michael De Vlieger, Apr 19 2016 *)

STATUS

reviewed

editing

#9 by Charles R Greathouse IV at Mon Apr 18 23:06:23 EDT 2016

STATUS

proposed

reviewed

#8 by Charles R Greathouse IV at Mon Apr 18 23:06:20 EDT 2016

STATUS

editing

proposed