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Number of increasing subsequences that can be made from the sequence of successive primes.
1

%I #7 Oct 17 2014 21:50:27

%S 1,2,3,5,8,14,25,40,68,105,160,245,352,508,742,1039,1497,2085,2823,

%T 3875,5362,7174,9607,12698,16837,25317,38608,56459,79955,111702,

%U 159319,232290,326331,460445,651956,897771,1241982,1699443,2326219,3130763,4283977,5671153,7764404,10359118,13883187

%N Number of increasing subsequences that can be made from the sequence of successive primes.

%C See A091955 for the precise definition of increasing subsequence.

%e For n = 4 we take 2357 and find that the increasing subsequence are

%e 2,3,5,7

%e 2,3,57

%e 2,357

%e 23,57

%e 2357

%e so a(4)=5

%Y Cf. A091955.

%K nonn,base

%O 1,2

%A Mohammed Bouayoun (bouyao(AT)wanadoo.fr), Mar 12 2004

%E More terms from _Sean A. Irvine_, Nov 22 2010