A160133 Values k such that A001065(x)= k has more than one solution.

1, 6, 8, 13, 14, 15, 16, 17, 19, 20, 21, 22, 23, 25, 27, 29, 31, 32, 33, 35, 37, 40, 41, 42, 43, 44, 45, 46, 47, 49, 50, 51, 53, 54, 55, 57, 59, 61, 62, 63, 64, 65, 67, 69, 71, 73, 74, 75, 76, 77, 79, 81, 83, 85, 87, 89, 90, 91, 92, 93, 95, 97, 99, 100, 101, 103, 104, 105

Offset

1,2

Comments

Numbers k with A048138(k) >= 2. Numbers k which occur in A001065 more than once. Number 1 and numbers k = A160095(n) with A160095(n+1) - A160095(n) = 0.

Links

Table of n, a(n) for n=1..68.

Example

a(3)=8 as the multiplicity of the value 8 is 2: 8 = A001065(10) = A001065(49).

Prog

(PARI) {z=105; v=vector(z); for(n=1, z^2, a=sigma(n)-n; if(0<a&&a<=z, v[a]++)); for(j=1, z, if(v[j]>1, print1(j, ", ")))} // Klaus Brockhaus, May 26 2009

Crossrefs

Cf. A048138, A001065, A160095.

Sequence in context: A327240 A274001 A324212 * A057710 A285678 A027706

Adjacent sequences: A160130 A160131 A160132 * A160134 A160135 A160136

Keyword

nonn

Author

Jaroslav Krizek, May 02 2009

Extensions

More terms from Klaus Brockhaus, May 26 2009

Status

approved