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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

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A140599 Grand total of prime factors in composite runs between two primes: first composite.

Original entry on oeis.org

4, 6, 12, 14, 18, 24, 54, 62, 68, 72, 80, 90, 108, 110, 158, 192, 234, 258, 264, 318, 338, 350, 354, 380, 420, 432, 458, 462, 570, 588, 602, 632, 662, 858, 978, 992, 1050, 1088, 1094, 1152, 1172, 1290, 1302, 1304, 1400, 1428, 1434, 1482, 1532, 1722, 1824, 1862
Offset: 1

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Author

Enoch Haga, May 18 2008

Keywords

Examples

			In the composite run between primes 23 and 29 there are five composites. The sum of prime factors in all 5 composites is 37 (3+2+5+13+2+3+7+2). The first composite in this run is 24, a(6) and the last is 28.

Crossrefs

Cf. A140600.

Formula

Compute composite runs between two primes. If the grand total of prime factors in each run is also prime, add the firat composite to the sequence.
{A008864(j): sum_{k=A008864(j)..A006093(j+1)} A105221(k) in A000040}. - R. J. Mathar, May 19 2008
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Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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