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Search: id:A140888
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| 6, 13, 15, 16, 18, 19, 20, 17, 21, 21, 22, 23, 18, 22, 26, 21, 22, 21, 24, 24, 22, 25, 22, 22, 26, 24, 22, 21, 28, 23, 25, 23, 25, 24, 26, 25, 22, 27, 27, 24, 27, 22, 24, 25, 23, 26, 23
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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If n=1 and (1 is composite, 11..113 is primes, 121 is composite, 127..139 is primes, 143 is composite, 149..167 is primes, 169 is composite, 173..181 is primes, 187 is composite, 191..199 is primes, 209 is composite) then a(1)=6
If n=7 and (1261..1273 is composites, 1277..1327 is primes, 1331..1357 is composites, 1361 is prime, 1363 is composite, 1367 is prime, 1369 is composite, 1373 and 1381 is primes, 1387..1397 is composites, 1399 is prime, 1403 is composite, 1409 is prime, 1411 and 1417 is composites, 1423..1439 is primes, 1441 is composite, 1447..1453 is primes, 1457 is composite, 1459 is prime, 1469 is composite) then a(7)=20.
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CROSSREFS
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Cf. A008364.
Sequence in context: A031113 A112610 A100205 this_sequence A053753 A090068 A070899
Adjacent sequences: A140885 A140886 A140887 this_sequence A140889 A140890 A140891
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KEYWORD
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nonn
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AUTHOR
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Juri-Stepan Gerasimov (2stepan(AT)rambler.ru), Jul 06 2008
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