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A085103 Indices of zeros in A085102. 1
1, 8, 12, 18, 22, 27, 32, 36, 39, 42, 45, 48, 49, 50, 54, 62, 66, 68, 69, 70, 75, 77, 81, 82, 87, 91, 94, 95, 98, 99, 100, 102, 104, 106, 110, 115, 116, 119, 121, 122, 125, 128, 129, 132, 133, 134, 138, 142, 146, 150, 154, 159, 160, 162, 165, 169, 170, 171, 175, 176 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..60.

EXAMPLE

8 is a member as 8, 8+4, 8+4+2 or 8+4+2+1 (8,12,14 and 15) all are composite.

PROG

(PARI) isok(n) = {d = divisors(n); p = 0; forstep (i=#d, 1, -1, p += d[i]; if (isprime(p), return (0)); ); return (1); } \\ Michel Marcus, Sep 17 2013

CROSSREFS

Cf. A085102.

Sequence in context: A054397 A075818 A090738 * A280968 A157940 A087696

Adjacent sequences:  A085100 A085101 A085102 * A085104 A085105 A085106

KEYWORD

nonn

AUTHOR

Amarnath Murthy and Meenakshi Srikanth (menakan_s(AT)yahoo.com), Jul 03 2003

EXTENSIONS

More terms from David Wasserman, Jan 26 2005

STATUS

approved

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Last modified April 20 09:59 EDT 2019. Contains 322309 sequences. (Running on oeis4.)