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A118377
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Least prime p such that p(n)#*p#-1 is prime.
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0
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2, 2, 2, 2, 3, 3, 2, 2, 13, 3, 13, 2, 3, 11, 7, 37, 151, 11, 113, 2, 5, 2, 401, 73, 7, 109, 3, 7, 101, 2, 11, 109, 5, 277, 11, 7, 31, 89, 191, 31, 11, 2713, 11, 13, 73, 461
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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EXAMPLE
| 2*2-1=3 prime 2=p(1)# so a(1)=2
2*3*2-1=11 prime 2*3=p(2)# so a(2)=2
2*3*5*2-1=59 prime 2*3*5=p(3)# so a(3)=2
2*3*5*7*2-1=419 prime 2*3*5*7=p(4)# so a(4)=2
2*3*5*7*11*2*3-1=13859 prime 2*3*5*7*11=p(5)# so a(5)=3
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CROSSREFS
| Sequence in context: A196046 A152724 A081743 * A023516 A156607 A093450
Adjacent sequences: A118374 A118375 A118376 * A118378 A118379 A118380
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KEYWORD
| nonn
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AUTHOR
| Pierre CAMI (pierre-cami(AT)bbox.fr), May 15 2006
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