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Search: id:A062067
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| A062067 |
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a(1) = 1; a(n) is smallest square > a(n-1) such that a(n) + a(n-1) is a prime. |
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+0
2
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| 1, 4, 9, 64, 169, 400, 529, 900, 961, 1936, 2401, 5476, 6241, 6400, 7921, 9216, 10201, 10816, 11025, 13456, 14161, 15376, 17161, 17956, 19321, 19600, 22201, 22500, 24649, 24964, 27225, 29584, 29929, 31684, 33489, 40804, 41209, 52900
(list; graph; listen)
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OFFSET
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1,2
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LINKS
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Harry J. Smith, Table of n, a(n) for n=1,...,1000
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EXAMPLE
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9 is the next term after 4 as 4+9 = 13 is a prime.
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PROGRAM
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(PARI) p=1:n=2:for(k=1, 50, while(!isprime(p^2+n^2), n=n+1):print1(n^2", "):p=n:n=n+1)
(PARI) { a=b=1; for (n=1, 1000, if (n>1, until (isprime(a + b^2), b++)); write("b062067.txt", n, " ", a=b^2) ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Jul 31 2009]
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CROSSREFS
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Sequence in context: A124683 A077163 A069711 this_sequence A110256 A095175 A055859
Adjacent sequences: A062064 A062065 A062066 this_sequence A062068 A062069 A062070
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KEYWORD
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nonn
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Jun 12 2001
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EXTENSIONS
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Corrected and extended by Ralf Stephan (ralf(AT)ark.in-berlin.de), Mar 22 2003
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