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A161913 Numbers k such that A001223(k) <> A000005(k). 5
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; text; internal format)
OFFSET

1,1

LINKS

Nathaniel Johnston, Table of n, a(n) for n = 1..10000

Omar E. Pol, Illustration: Divisors and pi(x)

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

CROSSREFS

Cf. A000005, A001223, A068526, A161911, A161912, A162188, A162189.

Sequence in context: A071768 A301478 A173297 * A020673 A166498 A266297

Adjacent sequences:  A161910 A161911 A161912 * A161914 A161915 A161916

KEYWORD

easy,nonn

AUTHOR

Omar E. Pol, Jul 04 2009

STATUS

approved

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Last modified October 16 13:51 EDT 2019. Contains 328093 sequences. (Running on oeis4.)