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A178610
n-th semiprime minus difference between the prime indices of the two factors of n-th semiprime.
0
4, 5, 9, 8, 11, 14, 19, 18, 25, 21, 30, 28, 34, 31, 35, 38, 49, 46, 53, 51, 49, 52, 62, 62, 63, 76, 70, 81, 73, 79, 89, 84, 80, 90, 91, 101, 109, 102, 116, 121, 105, 112, 117, 129, 116, 128, 123, 142, 138, 126, 147, 137, 145, 156, 144, 169, 162, 155, 167, 176, 185, 170
OFFSET
1,1
FORMULA
a(n)=A001358(n)-A176506(n).
CROSSREFS
Sequence in context: A200354 A328485 A021689 * A197268 A218505 A128891
KEYWORD
nonn
AUTHOR
EXTENSIONS
Corrected (153 replaced by 155) by R. J. Mathar, May 31 2010
STATUS
approved