The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A249802 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
Showing entries 1-10 | older changes

A249802

a(n) is the smallest prime q such that n(q-1)-1 is prime, that is, the smallest prime q so that n = (p+1)/(q-1) with p prime; or a(n) = -1 if no such q exists.
(history; published version)

#18 by Alois P. Heinz at Tue Feb 28 09:39:08 EST 2023

STATUS

proposed

approved

#17 by Michel Marcus at Tue Feb 28 09:34:24 EST 2023

STATUS

editing

proposed

#16 by Michel Marcus at Tue Feb 28 09:34:21 EST 2023

CROSSREFS

Cf. A060324, A062251, A064632, A249800 - , A249801, A249803.

#15 by Michel Marcus at Tue Feb 28 09:33:51 EST 2023

LINKS

Eric Weisstein's MathWorld, World of Mathematics, <a href="http://mathworld.wolfram.com/SchinzelsHypothesis.html "> Schinzel's Hypothesis</a>

STATUS

approved

editing

#14 by R. J. Mathar at Tue Dec 02 12:39:46 EST 2014

STATUS

editing

approved

#13 by R. J. Mathar at Tue Dec 02 12:39:32 EST 2014

CROSSREFS

Cf. A060324, A062251, A064632, A249800, A249801, - A249803-A249805.

STATUS

approved

editing

#12 by N. J. A. Sloane at Thu Nov 20 13:18:48 EST 2014

STATUS

editing

approved

#11 by N. J. A. Sloane at Thu Nov 20 13:18:45 EST 2014

NAME

a(n) is the minimal smallest prime q such that n(q-1)-1 is prime, that is, the smallest prime q so that n = (p+1)/(q-1) with p prime; or a(n) = -1 if no such q exists.

STATUS

proposed

editing

#10 by Jon E. Schoenfield at Fri Nov 07 19:27:01 EST 2014

STATUS

editing

proposed

#9 by Jon E. Schoenfield at Fri Nov 07 19:26:57 EST 2014

LINKS

Eric Weisstein's MathWorld, <a href="http://mathworld.wolfram.com/SchinzelsHypothesis.html "> Schinzel’'s Hypothesis</a>

STATUS

proposed

editing