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Search: id:A139430
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| A139430 |
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Smallest prime p such that M(n)^2+p*M(n)-1 is prime with M(n)= Mersenne primes =A000668(n). |
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+0
8
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| 3, 5, 11, 5, 11, 11, 17, 19, 23, 97, 127, 1009, 167, 269, 953, 479, 3307, 1453, 37507, 2357, 599, 17669, 5527, 3191, 3251, 70249, 147773
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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All primes certified using openpfgw_v12 from primeform group
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EXAMPLE
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3*3+3*3-1=17 prime 3=M(1)=2^2-1 so p(1)=3
7*7+5*7-1=83 prime 7=M(2)=2^3-1 so p(2)=5
31*31+11*31-1=1301 prime 31=M(3)=2^5-1 so p(3)=11
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CROSSREFS
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Cf. A000668, A139424, A139425, A139426, A139427, A139428, A139429, A139431.
Adjacent sequences: A139427 A139428 A139429 this_sequence A139431 A139432 A139433
Sequence in context: A060955 A024329 A064523 this_sequence A143386 A137656 A046228
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KEYWORD
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hard,more,nonn
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AUTHOR
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Pierre CAMI (pierrecami(AT)tele2.fr), Apr 21 2008
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