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Search: id:A079361
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| A079361 |
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Primes in the sequence of sums of alternating powers of 2. |
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+0
2
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| 5, 7, 19, 43, 379, 1531, 3067, 24571, 98299, 100663291, 6442450939, 51539607547, 844424930131963, 13510798882111483, 55340232221128654843
(list; graph; listen)
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OFFSET
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2,1
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COMMENT
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Sum or reciprocals = 0.4224131591021966740339033736..
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PROGRAM
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(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); }
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CROSSREFS
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Sequence in context: A073652 A106987 A084198 this_sequence A045447 A096636 A101588
Adjacent sequences: A079358 A079359 A079360 this_sequence A079362 A079363 A079364
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KEYWORD
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easy,nonn
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AUTHOR
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Cino Hilliard (hillcino368(AT)gmail.com), Feb 15 2003
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