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A224470
Numbers n such that 7^n - n is prime.
3
2, 6, 8, 12, 44, 48, 512, 1088, 1104, 6038
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OFFSET
1,1
COMMENTS
a(11) > 92000. -
Giovanni Resta
, Apr 08 2013
a(11) > 2*10^5. -
Robert Price
, Feb 11 2014
LINKS
Table of n, a(n) for n=1..10.
PROG
(PARI) forstep(n=2, 10^4, 2, if(ispseudoprime(7^n-n), print1(n, ", "))); /*
Joerg Arndt
, Apr 07 2013 */
CROSSREFS
Cf.
A048744
,
A058037
,
A057908
,
A058046
,
A058829
,
A224468
.
Sequence in context:
A030457
A296300
A358970
*
A168247
A229056
A186703
Adjacent sequences:
A224467
A224468
A224469
*
A224471
A224472
A224473
KEYWORD
nonn
,
more
AUTHOR
Alex Ratushnyak
, Apr 06 2013
STATUS
approved
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Last modified June 26 06:40 EDT 2024. Contains 373715 sequences. (Running on oeis4.)