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A073130
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a(n) = gcd(p(n+1) - p(n), p(p(n+1)) - p(p(n))), where p(n) is the n-th prime.
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3
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1, 2, 2, 2, 2, 2, 2, 4, 2, 2, 6, 2, 2, 4, 6, 6, 2, 6, 2, 2, 2, 2, 6, 8, 2, 2, 4, 2, 2, 2, 2, 2, 2, 2, 2, 6, 6, 4, 2, 2, 2, 2, 2, 2, 2, 4, 4, 4, 2, 4, 2, 2, 2, 6, 6, 6, 2, 2, 4, 2, 2, 2, 4, 2, 2, 2, 6, 2, 2, 2, 6, 4, 6, 6, 2, 6, 4, 2, 2, 2, 2, 2, 2, 6, 2, 6, 4, 2, 2, 4, 4, 2, 4, 2, 2, 2, 12, 2, 6, 2, 2, 2, 6, 2
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OFFSET
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1,2
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LINKS
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MAPLE
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seq(gcd(ithprime(n+1) - ithprime(n), ithprime(ithprime(n+1)) - ithprime(ithprime(n))), n=1..120); # G. C. Greubel, Oct 20 2019
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MATHEMATICA
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Table[GCD[Prime[n+1]-Prime[n], Prime[Prime[n+1]]-Prime[Prime[n]]], {n, 120}]
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PROG
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(PARI) vector(120, n, gcd(prime(n+1) - prime(n), prime(prime(n+1)) - prime(prime(n))) ) \\ G. C. Greubel, Oct 20 2019
(Magma) [GCD(NthPrime(n+1) - NthPrime(n), NthPrime(NthPrime(n+1)) - NthPrime(NthPrime(n))): n in [1..120]]; // G. C. Greubel, Oct 20 2019
(Sage) [gcd(nth_prime(n+1) - nth_prime(n), nth_prime(nth_prime(n+1)) - nth_prime(nth_prime(n))) for n in (1..120)] # G. C. Greubel, Oct 20 2019
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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