A085103 Indices of zeros in A085102.

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

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 * A392380 A280968 A157940

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