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A080102 Smallest prime power in all composite numbers between n-th prime and next prime, a(n)=1 if no such prime power exists. 2
4, 1, 8, 1, 16, 1, 1, 25, 1, 32, 1, 1, 1, 49, 1, 1, 64, 1, 1, 1, 81, 1, 1, 1, 1, 1, 1, 1, 121, 128, 1, 1, 1, 1, 1, 1, 1, 169, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 243, 256, 1, 1, 1, 1, 1, 1, 289, 1, 1, 1, 1, 1, 1, 343, 1, 1, 1, 361, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 (list; graph; refs; listen; history; internal format)
OFFSET

2,1

EXAMPLE

There are two prime powers between 32749=A000040(3512) and 32771=A000040(3513): 32761=181^2 and 32768=2^15, therefore a(3512)=32761, A080103(3512)=32768 and A080101(3512)=2.

CROSSREFS

Cf. A080101, A080103, A025475, A000961.

Sequence in context: A019768 A158496 A019425 * A106475 A134829 A130297

Adjacent sequences:  A080099 A080100 A080101 * A080103 A080104 A080105

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Jan 28 2003

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Last modified February 15 16:28 EST 2012. Contains 205823 sequences.