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A079361 Primes in the sequence of sums of alternating powers of 2. 2
5, 7, 19, 43, 379, 1531, 3067, 24571, 98299, 100663291, 6442450939, 51539607547, 844424930131963, 13510798882111483, 55340232221128654843 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,1

COMMENTS

Sum of reciprocals = 0.4224131591021966740339033736..

Primes in A079360. - R. J. Mathar, Dec 03 2014

LINKS

Table of n, a(n) for n=2..16.

PROG

(PARI) \ Primes in the sequence of sums of alternating powers of 2 pseq(n) = { j=a=1; p=2; sr=0; while(j<=n, a = a + 2^(p); if(isprime(a), print1(a" "); sr+=1.0/a; ); a = a+2^(p-1); if(isprime(a), print1(a" "); sr+=1.0/a; ); p+=1; j+=2; ); print(); print(sr); }

CROSSREFS

Sequence in context: A084198 A036061 A288608 * A162268 A045447 A159048

Adjacent sequences:  A079358 A079359 A079360 * A079362 A079363 A079364

KEYWORD

easy,nonn

AUTHOR

Cino Hilliard, Feb 15 2003

STATUS

approved

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Last modified August 17 17:00 EDT 2019. Contains 326059 sequences. (Running on oeis4.)