a prime year
01-01-2017, 06:12 PM
Post: #1
 Don Shepherd Senior Member Posts: 749 Joined: Dec 2013
a prime year
Welcome to 2017, a prime year!

When was the last prime year?

When will be the next prime year?
01-01-2017, 07:05 PM
Post: #2
 Massimo Gnerucci Senior Member Posts: 2,460 Joined: Dec 2013
RE: a prime year
Also... 9² + 44² = 2017

Greetings,
Massimo

-+×÷ ↔ left is right and right is wrong
01-01-2017, 07:07 PM
Post: #3
 Massimo Gnerucci Senior Member Posts: 2,460 Joined: Dec 2013
RE: a prime year
(01-01-2017 06:12 PM)Don Shepherd Wrote:  Welcome to 2017, a prime year!

When was the last prime year?

When will be the next prime year?

2011
2027

Greetings,
Massimo

-+×÷ ↔ left is right and right is wrong
01-01-2017, 09:45 PM
Post: #4
 Don Shepherd Senior Member Posts: 749 Joined: Dec 2013
RE: a prime year
(01-01-2017 07:07 PM)Massimo Gnerucci Wrote:
(01-01-2017 06:12 PM)Don Shepherd Wrote:  Welcome to 2017, a prime year!

When was the last prime year?

When will be the next prime year?

2011
2027

right!!
01-02-2017, 09:23 AM
Post: #5
 Gilles59 Member Posts: 136 Joined: Jan 2017
RE: a prime year
PREVPRIME LASTARG NEXTPRIME
01-02-2017, 02:17 PM
Post: #6
 Harald Senior Member Posts: 760 Joined: Dec 2013
RE: a prime year
(01-01-2017 09:45 PM)Don Shepherd Wrote:
(01-01-2017 07:07 PM)Massimo Gnerucci Wrote:  2011
2027

right!!

I'll vote for a "lastprime" function in the WP34s if you are going to ask more questions like that
01-02-2017, 08:05 PM
Post: #7
 Paul Dale Senior Member Posts: 1,753 Joined: Dec 2013
RE: a prime year
(01-02-2017 02:17 PM)Harald Wrote:  I'll vote for a "lastprime" function in the WP34s if you are going to ask more questions like that

The code is in XROM, just not included in any image:

Code:
        XLBL"PREVPRIME"             INTM?                 JMP prevprime_xin             DBL?                 JMP prevprime_dbl             xIN MONADIC             _INT 50             _INT 16             10[^x]             STO+ Y             RCL Z             x>? Z                 ERR ERR_DOMAIN             MIN             JMP prevprime_skip_xin prevprime_dbl::        [infinity]?                 ERR ERR_DOMAIN prevprime_xin::        xIN MONADIC prevprime_skip_xin::    CEIL             PRIME?                 DEC X             x[<=]1?                 ERR ERR_DOMAIN             EVEN? prevprime_loop::        DEC X             x[<=]1?                 JMP prime_2             PRIME?                 xOUT xOUT_NORMAL             DEC X             JMP prevprime_loop

It would be easy enough to key this in as a user program.

Pauli
01-02-2017, 10:58 PM
Post: #8
 JMBaillard Junior Member Posts: 27 Joined: Dec 2013
RE: a prime year
Happy New Year to everyone.

A few funny things about 2017:

2017 = 9^2+44^2
= 12^2+28^2+33^2
= 7^3+7^3+11^3
= 6^3+7^3+9^3+9^3
= 2^3+4^3+6^3+9^3+10^3
= 1^3+6^3+6^3+7^3+8^3+9^3 = ....

Best wishes,
JM.
01-03-2017, 05:59 AM
Post: #9
 Gerald H Senior Member Posts: 1,488 Joined: May 2014
RE: a prime year
Puzzle from The Guardian:

https://www.theguardian.com/science/2017...w-equation
01-04-2017, 02:00 PM
Post: #10
 Eddie W. Shore Senior Member Posts: 1,302 Joined: Dec 2013
RE: a prime year
Happy New Prime Year!
01-07-2017, 12:39 PM
Post: #11
 Gerald H Senior Member Posts: 1,488 Joined: May 2014
RE: a prime year
While prime, not a perfect year:

https://oeis.org/A061013
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