_Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), _, Mar 17 2003

OEIS Server: https://oeis.org/edit/global/246

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Reinhard Zumkeller (reinhard.zumkeller(AT)lhsystemsgmail.com), Mar 17 2003

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

1,2

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

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Reinhard Zumkeller (reinhard.zumkeller(AT)lhsystems.com), Mar 17 2003

approved