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A102324
Primes of the form Sum[7^i, {i, 0, n}] + 1 - Mod[Sum[7^i, {i, 0, n}], 2].
1
401, 2801, 19609, 2306881201, 16148168401, 441955140976608911963170563601, 51995580380757061883555053636996009, 103277498764237935298508446601504482183281737967152502422497452803442129350499861144992195052660926412401
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OFFSET
1,1
COMMENTS
a(13) has 1436 decimal digits. -
Vincenzo Librandi
, Jul 19 2012
LINKS
Vincenzo Librandi,
Table of n, a(n) for n = 1..12
MATHEMATICA
a = Delete[Union[Table[If[PrimeQ[Sum[7^i, {i, 0, n}] + 1 - Mod[Sum[7^i, {i, 0, n}], 2]] == True, Sum[7^i, {i, 0, n}] + 1 - Mod[Sum[7^i, {i, 0, n}], 2], 0], {n, 0, 200}]], 1]
CROSSREFS
Sequence in context:
A094614
A104926
A031718
*
A156785
A031628
A179293
Adjacent sequences:
A102321
A102322
A102323
*
A102325
A102326
A102327
KEYWORD
nonn
AUTHOR
Roger L. Bagula
, Mar 15 2005
EXTENSIONS
Corrected a(8). -
Vincenzo Librandi
, Jul 19 2012
STATUS
approved
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Last modified August 18 01:44 EDT 2024. Contains 375255 sequences. (Running on oeis4.)