cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

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A146764 Primes not in A075255.

Original entry on oeis.org

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
Offset: 1

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Author

M. F. Hasler, Nov 04 2008

Keywords

Comments

It has been asked whether A146071 contains all primes. The answer is no: since A075255(n) > n/2-2 for nonprime 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.

Crossrefs

Cf. A075255, A146071, A145834.

Programs

  • 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<
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Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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