A088071 Number sandwiched between two numbers having only one prime divisor.

3, 4, 6, 8, 10, 12, 18, 24, 26, 28, 30, 42, 48, 60, 72, 80, 82, 102, 108, 126, 138, 150, 168, 180, 192, 198, 228, 240, 242, 270, 282, 312, 348, 360, 420, 432, 462, 522, 570, 600, 618, 642, 660, 728, 810, 822, 828, 840, 858, 882, 1020, 1032, 1050, 1062, 1092, 1152

Offset

1,1

Comments

A014574 (average of twin prime pairs) is a subsequence.

Links

Table of n, a(n) for n=1..56.

Prog

(PARI) for(n=2, 1200, if(matsize(factor(n-1))[1]*matsize(factor(n+1))[1]==1, print1(n, ", ")))

Crossrefs

Cf. A014574, A088072.

Sequence in context: A206580 A291899 A059608 * A247422 A256698 A024182

Adjacent sequences: A088068 A088069 A088070 * A088072 A088073 A088074

Keyword

nonn

Author

Amarnath Murthy, Sep 22 2003

Extensions

Edited and extended by Klaus Brockhaus, Sep 25 2003

Status

approved