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Search: id:A146764
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| 13, 61, 73, 109, 151, 181, 229, 241, 257, 293, 307, 313, 349, 353, 373, 397, 409, 487, 509, 557, 571, 577, 601, 613, 643, 653, 661, 709, 727, 733, 739, 751, 761, 773, 811, 823, 937, 941, 977
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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It has been asked whether A146071 contains all primes. The answer is "no": since A075255(n) > n/2-2 for non-prime n, any prime p that did not appear until the rank 2(p+2) is not in A075255. This is a sufficient condition for not being in A146071, but unless proved otherwise, there may be primes in A075255, i.e. not listed here, which nevertheless do not appear in A146071.
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PROGRAM
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(PARI) A146764( END=999 )={ local( n=1, t=0, k); forprime( p=1, END, while( n<2*(p+2), isprime( k=A075255(n++)) | next; t=bitor(1<<primepi(k), t)); bittest(t, primepi(p)) | print1(p", "))}
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CROSSREFS
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Cf. A075255, A146071, A145834.
Sequence in context: A163833 A124864 A126400 this_sequence A145474 A002647 A118711
Adjacent sequences: A146761 A146762 A146763 this_sequence A146765 A146766 A146767
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KEYWORD
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easy,nonn
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AUTHOR
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M. F. Hasler (MHasler(AT)univ-ag.fr), Nov 04 2008
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