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A195137 Primes of the form abs(2^n - prime(n)^2). 0
2, 5, 17, 89, 1087, 30559, 127591, 8381719, 134207119, 140737488310807, 3450873173395281893717377931138512726225554486085193277581262109788439 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

The next term has 138 digits. - Harvey P. Dale, Jun 01 2014

LINKS

Table of n, a(n) for n=1..11.

MATHEMATICA

Union[Select[Table[Abs[2^n-Prime[n]^2], {n, 500}], PrimeQ]] (* Harvey P. Dale, Jun 01 2014 *)

PROG

(PARI) print1("2, 5, 17, 89"); n=10; forprime(p=31, 1e4, if(isprime(t=abs(2^n++-p^2)), print1(", "t))) \\ Charles R Greathouse IV, Sep 11 2011

CROSSREFS

Sequence in context: A016121 A216519 A245108 * A026822 A059248 A203006

Adjacent sequences:  A195134 A195135 A195136 * A195138 A195139 A195140

KEYWORD

nonn

AUTHOR

Juri-Stepan Gerasimov, Sep 09 2011

EXTENSIONS

Terms corrected by Charles R Greathouse IV, Sep 11 2011

STATUS

approved

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Last modified December 22 21:10 EST 2014. Contains 252372 sequences.