Comment on A001358
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From Robert G. Wilson v, Thu Feb  9 00:05:13 2012

Dear Neil,

    I have invested about 2500 CPU hours of work here, the results of which are the following:

The k*10^n_th semiprime for k=1..1000.

n:
0: {4, 6, 9, 10, 14, 15, 21, 22, 25, 26, 33, 34, 35, 38, 39, 46, 49, 51, 55, ...       3595}
1: {26, 57, 87, 121, 146, 185, 214, 249, 289, 314, 341, 382, 413, 453, 485, ...       40882}
2: {314, 669, 1003, 1355, 1735, 2098, 2474, 2866, 3202, 3595, 3985, 4369, ...        459577}
3: {3595, 7453, 11465, 15591, 19643, 23921, 28073, 32243, 36591, 40882, ...         5109839}
4: {40882, 84829, 129907, 175579, 222257, 269129, 316091, 363963, 411499, ...      56168169}
5: {459577, 950413, 1452655, 1962803, 2477434, 2997569, 3521198, 4048089, ...     611720495}
6: {5109839, 10524989, 16055882, 21662887, 27323326, 33030586, 38769567, ...     6609454805}
7: {56168169, 115365667, 175700215, 236756413, 298368941, 360401711, ...        70937808071}
8: {611720495, 1253228037, 1905907593, 2565812401, 3231032227, 3900571073, ... 757060825018}
9: {6609454805, 13512118267, 20524471945, 27607912077, 34743951471, ...       8040423200947}
10: {70937808071, 144761867459, 219665939853, 295268985611, 371391620063, ... 85037651263063}
11: {757060825018, 1542549510421, 2338681266751, 3141707315291, 3949849571471, ... (130) 111230242596271}
12: {8040423200947, 16361119965727, 24786806291419, 33280500271234, ...             (13) 111230242596271}

    As you can see, the last two sequences have less than the 'normal' one thousand terms with just 130 and 13 terms respectfully.