A013581 Let P = 2*3*5*..*p_n = n-th primorial number (A002110), G = Z_2xZ_3x...xZ_{p_n}; a(n) = max{e in G} min{i : both e+i, e-i are relatively prime to P}.

1, 3, 9, 15, 33, 75, 90, 105, 165, 213

Offset

1,2

Links

Table of n, a(n) for n=1..10.

Crossrefs

Sequence in context: A031159 A058039 A371349 * A350536 A133997 A057909

Adjacent sequences: A013578 A013579 A013580 * A013582 A013583 A013584

Keyword

nonn

Author

Paw Hermansen (paw(AT)imada.ou.dk)

Extensions

I added the two terms a(9)=165 and a(10)=213, which were found by a computer program that searched through all numbers. Michael Hovdan (michael.hovdan(AT)gmail.com), Aug 31 2009

Status

approved