A081303 gpf(m) - 2*spf(m), where gpf(m) is the greatest and spf(m) is the smallest prime factor of m (A006530, A020639).

-1, -2, -3, -2, -5, -1, -7, -2, -3, 1, -11, -1, -13, 3, -1, -2, -17, -1, -19, 1, 1, 7, -23, -1, -5, 9, -3, 3, -29, 1, -31, -2, 5, 13, -3, -1, -37, 15, 7, 1, -41, 3, -43, 7, -1, 19, -47, -1, -7, 1, 11, 9, -53, -1, 1, 3, 13, 25, -59, 1, -61, 27, 1, -2, 3, 7, -67, 13, 17, 3, -71, -1, -73, 33, -1, 15

Offset

1,2

Links

Table of n, a(n) for n=1..76.

Crossrefs

Cf. A046665, A081304, A081305, A081306, A069900.

Sequence in context: A178375 A086847 A098228 * A369044 A164880 A267068

Adjacent sequences: A081300 A081301 A081302 * A081304 A081305 A081306

Keyword

sign

Author

Reinhard Zumkeller, Mar 17 2003

Status

approved