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A228003
Places of records of A227321.
1
0, 4, 11, 13, 19, 31, 43, 61, 73, 103, 109, 139, 151, 181, 193, 199, 211, 223, 229, 241, 271, 283, 313, 349, 379, 409, 421, 433, 439, 463, 523, 571, 601, 613, 619, 631, 643, 649
OFFSET
1,2
COMMENTS
Records of A227321 are 3, 4, 5, 8, 11, 17, 23, 32, 38,....
The first 3 nonprimes are a(1)=0, a(2)=4, a(38)=649.
The sequence contains all greaters of twin primes more than 7 (see A006512).
LINKS
FORMULA
For n>=4, A227321(a(n)) = (a(n) + 3)/2.
CROSSREFS
Sequence in context: A266281 A154040 A066985 * A347561 A234903 A369615
KEYWORD
nonn
AUTHOR
Vladimir Shevelev, Aug 07 2013
EXTENSIONS
More terms from Peter J. C. Moses, Aug 07 2013
STATUS
approved