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A103651 The set N of numbers such that each positive integer can be written in the form p + n, where p is 0 or a prime and n in N, in an even number of ways. 1
0, 2, 3, 4, 5, 12, 15, 19, 21, 24, 26, 30, 31, 32, 33, 37, 38, 40, 42, 43, 44, 47, 48, 49, 50, 51, 52, 53, 54, 60, 61, 68, 69, 71, 73, 74, 78, 79, 80, 82, 84, 85, 87, 90, 94, 103, 107, 110, 111, 115, 117, 120, 124, 127, 136, 140, 141, 142, 143, 144, 145, 146, 147, 150, 156, 157 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..66.

FORMULA

The terms are the exponents in the expansion of 1/S read mod 2 where S = 1 + Sum_{p prime} x^p.

CROSSREFS

Cf. A108345, A132229.

Sequence in context: A250049 A132027 A306077 * A093713 A057472 A117577

Adjacent sequences:  A103648 A103649 A103650 * A103652 A103653 A103654

KEYWORD

nonn

AUTHOR

Nadia Heninger and N. J. A. Sloane, Dec 16 2007

STATUS

approved

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Last modified November 21 06:00 EST 2019. Contains 329350 sequences. (Running on oeis4.)