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A138582 Numbers n such that 2^(2*n-19)-19 is prime. 0
10, 11, 12, 13, 15, 17, 19, 20, 25, 29, 43, 44, 52, 88, 95, 105, 137, 155, 199 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..19.

EXAMPLE

2^(2*15-19)-19=2029, 2^(2*17-19)-19=32749, ...

MATHEMATICA

q=19; For[i=q, i<=q, a={}; Do[x=2^(2*n-i)-i; If[PrimeQ[x], AppendTo[a, n]], {n, 10^2}]; Print["2^(2*n-", i, ")-", i, " ", a]; i=i+2]

PROG

(PARI) is(n)=isprime(2^(2*n-19)-19) \\ Charles R Greathouse IV, Jun 13 2017

CROSSREFS

Sequence in context: A270040 A339093 A072554 * A215059 A308105 A066309

Adjacent sequences:  A138579 A138580 A138581 * A138583 A138584 A138585

KEYWORD

nonn,easy

AUTHOR

Vladimir Joseph Stephan Orlovsky, May 13 2008

STATUS

approved

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Last modified June 27 19:31 EDT 2022. Contains 354898 sequences. (Running on oeis4.)