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Search: id:A051902
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| A051902 |
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Minimal primorial safe primes: p and primorial*p+1 are both primes. |
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+0
1
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| 5, 13, 61, 421, 4621, 150151, 8678671, 106696591, 2454021571, 71166625531, 401120980261, 170676977100631, 2129751844690471, 562558737261811291, 11682905869181336791, 97767475431570134191, 9613801750771063195351
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OFFSET
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1,1
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COMMENT
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In A051888 the first 25 values includes 13 distinct ones, while here all corresponding min-primorial-safe-primes are different. {2,5,17,11,23,43,19,3,7,61,53,41,47}
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FORMULA
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a[n] = 1+A002110[n]*A051887
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EXAMPLE
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The first five of A051887 sequence is 2, so the first 5 terms have the 1+2*A002110[n] form:5,13,61,421,4621, which are smallest terms in A005385, A051644, A051646, A051648, A051649. The 6th term here is A051651[1]=A051887[6]*A002110[6]+1=5*30030+1.
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CROSSREFS
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A005385, A002110, A051644, A051646, A051648, A051649.
Sequence in context: A149567 A149568 A144725 this_sequence A149569 A149570 A149571
Adjacent sequences: A051899 A051900 A051901 this_sequence A051903 A051904 A051905
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KEYWORD
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nonn
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AUTHOR
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Labos E. (labos(AT)ana.sote.hu), Dec 16 1999
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