|
Search: id:A102940
|
|
|
| A102940 |
|
Numbers n such that 10^n + 6*R_n + 1 is prime, where R_n = 11...1 is the repunit (A002275) of length n. |
|
+0
2
|
|
| 0, 1, 2, 3, 5, 9, 11, 14, 32, 54, 55, 60, 153, 200, 461, 569, 840, 847, 1296, 1356, 2007, 2627, 2847, 3110, 6876, 9161
(list; graph; listen)
|
|
|
OFFSET
|
1,3
|
|
|
COMMENT
|
Also numbers n such that (5*10^n+1)/3 is prime.
|
|
LINKS
|
Makoto Kamada, Factorizations of 166...667.
Index entries for primes involving repunits.
|
|
MATHEMATICA
|
Do[ If[ PrimeQ[(5*10^n + 1)/3], Print[n]], {n, 0, 10000}]
|
|
CROSSREFS
|
Numbers n such that A126109(n) is prime.
Cf. A000040, A126109.
Sequence in context: A137518 A137509 A014109 this_sequence A157049 A059042 A157604
Adjacent sequences: A102937 A102938 A102939 this_sequence A102941 A102942 A102943
|
|
KEYWORD
|
more,nonn
|
|
AUTHOR
|
Robert G. Wilson v (rgwv(AT)rgwv.com), Dec 16 2004
|
|
EXTENSIONS
|
Edited by N. J. A. Sloane (njas(AT)research.att.com), Mar 16 2007
|
|
|
Search completed in 0.002 seconds
|
