A091265 Take sequence of prime numbers (A000040) and reverse successive subsequences of lengths 1,2,3,4,...

2, 5, 3, 13, 11, 7, 29, 23, 19, 17, 47, 43, 41, 37, 31, 73, 71, 67, 61, 59, 53, 107, 103, 101, 97, 89, 83, 79, 151, 149, 139, 137, 131, 127, 113, 109, 197, 193, 191, 181, 179, 173, 167, 163, 157, 257, 251, 241, 239, 233, 229, 227, 223, 211, 199, 317, 313, 311, 307

Offset: 1

Author

Felix Tubiana, Feb 23 2004

Keywords

• easy
• nonn

Links

• Robert Israel, Table of n, a(n) for n = 1..10000

Crossrefs

Cf. A000040, A038722.

Programs

Maple

S:= ListTools:-PartialSums([$1..20]):
P:= [seq(ithprime(i),i=1..S[-1])]:
map(op, [[P[1]],seq(ListTools:-Reverse(P[S[i]+1..S[i+1]]),i=1..nops(S)-1)]); # Robert Israel, Sep 04 2017

Formula

a(n) = A000040(A038722(n)). - M. F. Hasler, Aug 24 2014

Extensions

Offset changed from 0 to 1 by M. F. Hasler, Aug 24 2014