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A076871 Sum of two powerful(1) numbers (A001694). 12
2, 5, 8, 9, 10, 12, 13, 16, 17, 18, 20, 24, 25, 26, 28, 29, 31, 32, 33, 34, 35, 36, 37, 40, 41, 43, 44, 45, 48, 50, 52, 53, 54, 57, 58, 59, 61, 63, 64, 65, 68, 72, 73, 74, 76, 80, 81, 82, 85, 88, 89, 90, 91, 96, 97, 98, 99, 100, 101, 104, 106, 108, 109, 112, 113, 116, 117 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

A085252(a(n))>0; complement of A085253. - Reinhard Zumkeller, Jun 23 2003

REFERENCES

A. Ivic, The Riemann Zeta-Function, Wiley, NY, 1985, see p. 439.

LINKS

Table of n, a(n) for n=1..67.

Valentin Blomer, Binary quadratic forms with large discriminants and sums of two squareful numbers II, Journal of the London Mathematical Society 71:1 (2005), pp. 69-84.

FORMULA

Blomer shows that there are x/log^k x sums of two powerful numbers up to x, where k = 0.20629947... is A261883. - Charles R Greathouse IV, Sep 04 2015

CROSSREFS

Cf. A001694, A076872, A261883. Different from A070049.

Sequence in context: A288730 A276784 A153129 * A070049 A085254 A274035

Adjacent sequences:  A076868 A076869 A076870 * A076872 A076873 A076874

KEYWORD

nonn,easy,changed

AUTHOR

N. J. A. Sloane, Nov 25 2002

EXTENSIONS

More terms from Vladeta Jovovic, Nov 25 2002

STATUS

approved

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Last modified January 26 05:10 EST 2020. Contains 331273 sequences. (Running on oeis4.)