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A145714
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a(n)=ceil(sqrt(2A145701(n)))
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2
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3, 5, 6, 11, 12, 19, 25, 29, 42, 48, 65, 72, 79, 84, 90, 101, 174, 204, 205, 209, 221, 245, 264, 275, 289, 299, 306, 349, 371, 372, 408, 409, 415, 449, 456, 474, 521, 535, 546, 569, 571, 575, 594
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| If p_n is the n-th prime, then ceil(sqrt(2p_n)) is in the sequence iff A145236(n)=A145236(n+1).
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MAPLE
| Contribution from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Aug 02 2010: (Start)
A145701 :=proc(n) local p; if n = 1 then return 3; end if; p := nextprime(procname(n-1)) ; while true do if isprime(p) and isprime(p+2) then if floor(sqrt(2*p)) <> floor( sqrt(2*p+4)) then return p; end if; end if; p := nextprime(p) ; end do; end proc:
A145714 := proc(n) ceil(sqrt(2*A145701(n))) ; end proc:
for n from 1 to 80 do printf("%d, \n", A145714(n)) ; end do; (End)
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CROSSREFS
| A145236, A145701
Sequence in context: A167522 A001838 A080759 * A047443 A173593 A127577
Adjacent sequences: A145711 A145712 A145713 * A145715 A145716 A145717
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KEYWORD
| nonn
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AUTHOR
| Vladimir Shevelev (shevelev(AT)bgu.ac.il), Oct 16 2008
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EXTENSIONS
| More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Aug 02 2010
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