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A123370 Primes of the form (2^n + 7)/3. 0
3, 5, 13, 173, 699053, 3301173438094347399730997933, 15589350798196297794172638215640352209663280458413 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Corresponding n's are 1,3,5,9,21,93 (all but n=3 are of the form n=4m+1, m=0,1,2,5,23...). Cf. A123250 = primes of the form 2^n + 5.

LINKS

Table of n, a(n) for n=1..7.

MATHEMATICA

Select[(2^Range[0, 1000]+7)/3, PrimeQ] (* Harvey P. Dale, May 20 2013 *)

CROSSREFS

Cf. A123250.

Sequence in context: A121533 A187733 A087170 * A110407 A062698 A200769

Adjacent sequences:  A123367 A123368 A123369 * A123371 A123372 A123373

KEYWORD

nonn

AUTHOR

Zak Seidov, Oct 12 2006

EXTENSIONS

a(7) from Harvey P. Dale, May 20 2013

STATUS

approved

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Last modified June 16 13:25 EDT 2019. Contains 324152 sequences. (Running on oeis4.)