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Search: id:A121173
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A121173 Sequence S with property that for n is S, a(n)=a(1)+a(2)+...+a(n-1) and for n not in S, a(n)=n+1. +0
3
2, 2, 4, 8, 6, 22, 8, 52, 10, 114, 12, 240, 14, 494, 16, 1004, 18, 2026, 20, 4072, 22, 8166, 24, 16356, 26, 32738, 28, 65504, 30, 131038, 32, 262108, 34, 524250, 36, 1048536, 38, 2097110, 40, 4194260, 42, 8388562, 44, 16777168, 46, 33554382 (list; graph; listen)
OFFSET

1,1

COMMENT

a(1)=1 cannot happen, so the sequence S starts with a(1)=2.

Note that a(n)=a(1)+a(2)+...+a(n-1) can hold even if n is not in S. The smallest example is n=3.

CROSSREFS

Cf. A105753, A121053, A121174, A121175.

Sequence in context: A077968 A123958 A048572 this_sequence A160159 A101651 A132007

Adjacent sequences: A121170 A121171 A121172 this_sequence A121174 A121175 A121176

KEYWORD

nonn

AUTHOR

Max Alekseyev, Aug 15 2006

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Last modified November 24 23:16 EST 2009. Contains 167481 sequences.


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