The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A224700 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
Showing entries 1-10 | older changes

A224700

a(n) = smallest prime p such that p + prime(n)# is next prime after p, where primorial prime(n)# = 2*3*..*prime(n).
(history; published version)

#11 by T. D. Noe at Tue Apr 16 12:14:03 EDT 2013

STATUS

reviewed

approved

#10 by Joerg Arndt at Tue Apr 16 11:24:43 EDT 2013

STATUS

proposed

reviewed

#9 by Thomas Ordowski at Tue Apr 16 10:44:43 EDT 2013

STATUS

editing

proposed

#8 by Thomas Ordowski at Tue Apr 16 10:40:21 EDT 2013

FORMULA

a(n) = A000230(A002110(n)/2).

STATUS

proposed

editing

#7 by Joerg Arndt at Tue Apr 16 09:21:55 EDT 2013

STATUS

editing

proposed

#6 by Joerg Arndt at Tue Apr 16 09:21:48 EDT 2013

KEYWORD

nonn,hard,more,changed

STATUS

proposed

editing

#5 by Thomas Ordowski at Tue Apr 16 07:39:51 EDT 2013

STATUS

editing

proposed

#4 by Thomas Ordowski at Tue Apr 16 07:37:58 EDT 2013

CROSSREFS

Cf. A001223, A000230.

STATUS

proposed

editing

#3 by Thomas Ordowski at Tue Apr 16 06:55:45 EDT 2013

STATUS

editing

proposed

#2 by Thomas Ordowski at Tue Apr 16 06:47:25 EDT 2013

NAME

allocated for Thomas Ordowskia(n) = smallest prime p such that p + prime(n)# is next prime after p, where primorial prime(n)# = 2*3*..*prime(n).

DATA

3, 23, 4297, 20831323

OFFSET

1,1

COMMENTS

a(5) > 10^20.

EXAMPLE

a(2)=23 because 23 is smallest prime such that 23+2*3=29 is next prime.

CROSSREFS

Cf. A001223.

KEYWORD

allocated

nonn,more

AUTHOR

Thomas Ordowski, Apr 16 2013

STATUS

approved

editing