The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A225191

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A225191

Numbers n such that (15^n + 2^n)/17 is prime.
(history; published version)

#21 by T. D. Noe at Mon Jul 29 12:02:18 EDT 2013

STATUS

reviewed

approved

#20 by Joerg Arndt at Mon Jul 29 11:58:59 EDT 2013

STATUS

proposed

reviewed

#19 by Joerg Arndt at Mon Jul 29 09:45:05 EDT 2013

STATUS

editing

proposed

#18 by Joerg Arndt at Mon Jul 29 09:44:48 EDT 2013

COMMENTS

All terms are primeodd primes.

PROG

(PARI) forprime(p=3, 10^6, if(ispseudoprime((15^p + 2^p)/17), print1(p, ", ") ) ); \\ Joerg Arndt, Jul 29 2013

STATUS

proposed

editing

#17 by Robert Price at Mon Jul 29 09:35:42 EDT 2013

STATUS

editing

proposed

#16 by Robert Price at Mon Jul 29 09:35:35 EDT 2013

DATA

2, 3, 67, 199, 479, 563, 2243, 2579, 6599, 7951, 10099, 10909, 13759

COMMENTS

a(1413) > 10^5.

EXTENSIONS

Removed incorrect first term of "2".

STATUS

approved

editing

#15 by T. D. Noe at Tue May 07 20:39:14 EDT 2013

STATUS

proposed

approved

#14 by Robert Price at Tue May 07 20:35:18 EDT 2013

STATUS

editing

proposed

#13 by Robert Price at Tue May 07 20:34:33 EDT 2013

NAME

allocated for Robert PriceNumbers n such that (15^n + 2^n)/17 is prime.

DATA

2, 3, 67, 199, 479, 563, 2243, 2579, 6599, 7951, 10099, 10909, 13759

OFFSET

1,1

COMMENTS

All terms are prime.

a(14) > 10^5.

MATHEMATICA

Select[Prime[Range[1, 100000]], PrimeQ[(15^# + 2^#)/17]&]

CROSSREFS

Cf. A057181, A125956, A125957, A222265.

KEYWORD

allocated

nonn,hard,more

AUTHOR

Robert Price, May 07 2013

STATUS

approved

editing

#12 by Robert Price at Tue May 07 20:34:33 EDT 2013

NAME

allocated for Robert Price

KEYWORD

recycled

allocated