The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A083557 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
Showing entries 1-10 | older changes

A083557

a(n) is the greatest prime factor of 3*a(n-1)+2.
(history; published version)

#14 by N. J. A. Sloane at Sat Jul 15 11:26:38 EDT 2017

STATUS

reviewed

approved

#13 by Joerg Arndt at Sat Jul 15 06:56:25 EDT 2017

STATUS

proposed

reviewed

#12 by Colin Barker at Sat Jul 15 05:20:59 EDT 2017

STATUS

editing

proposed

#11 by Colin Barker at Sat Jul 15 05:20:22 EDT 2017

FORMULA

G.f.: x*(3 + 11*x + 7*x^2 + 23*x^3 + 71*x^4 + 43*x^5 + 131*x^6 + 79*x^7 + 239*x^8 + 719*x^9 + 127*x^10 + 383*x^11 + 1151*x^12 + 691*x^13 + 83*x^14 + 251*x^15 + 151*x^16 + 13*x^17 + 41*x^18 + 2*x^19 + 6*x^20 + 46*x^21) / (1 - x^19) (conjectured). - Colin Barker, Jul 15 2017

STATUS

proposed

editing

#10 by Michel Marcus at Sat Jul 15 02:50:30 EDT 2017

STATUS

editing

proposed

#9 by Michel Marcus at Sat Jul 15 02:49:33 EDT 2017

COMMENTS

Conjecture verified up to 25000000 by Jud McCranie, Jun 11 2003

PROG

(PARI) lista(nn) = {print1(a = 3, ", "); for (n=1, nn, a = vecmax(factor(3*a+2)[, 1]); print1(a, ", "); ); } \\ Michel Marcus, Jul 15 2017

EXTENSIONS

Conjecture verified up to 25000000 by Jud McCranie, Jun 11 2003

STATUS

approved

editing

#8 by N. J. A. Sloane at Tue Apr 19 01:07:33 EDT 2016

AUTHOR

_Yasutoshi Kohmoto (zbi74583(AT)boat.zero.ad.jp), _, Jun 05 2003

Discussion

Tue Apr 19

01:07

OEIS Server: https://oeis.org/edit/global/2496

#7 by Alois P. Heinz at Mon Feb 16 19:17:44 EST 2015

STATUS

reviewed

approved

#6 by Wesley Ivan Hurt at Mon Feb 16 19:16:27 EST 2015

STATUS

proposed

reviewed

#5 by Jon E. Schoenfield at Mon Feb 16 18:41:38 EST 2015

STATUS

editing

proposed