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4, 9, 10, 11, 12, 15, 16, 19, 20, 21, 23, 25, 26, 28, 29, 30, 31, 33, 34, 35, 36, 37, 39, 40, 42, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 77, 78
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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LINKS
| Nathaniel Johnston, Table of n, a(n) for n = 1..10000
O. E. Pol, Illustration: Divisors and pi(x)
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MAPLE
| p2:=2:for n from 1 to 78 do p1:=p2:p2:=ithprime(n+1):if(p2-p1<>tau(n))then print(n); fi:od: # Nathaniel Johnston, Apr 15 2011
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CROSSREFS
| Cf. A000005, A001223, A068526, A161911, A161912, A162188, A162189.
Sequence in context: A088037 A071768 A173297 * A020673 A166498 A174800
Adjacent sequences: A161910 A161911 A161912 * A161914 A161915 A161916
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KEYWORD
| easy,nonn
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AUTHOR
| Omar E. Pol (info(AT)polprimos.com), Jul 04 2009
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