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Search: id:A154411
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| A154411 |
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Numbers p (prime) such that (p^2+1)/10 is prime |
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+0
2
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| 7, 13, 17, 23, 37, 53, 67, 97, 103, 113, 127, 137, 163, 167, 197, 223, 227, 263, 277, 283, 347, 367, 373, 383, 397, 433, 503, 547, 587, 617, 653, 673, 677, 683, 773, 797, 823, 877, 883, 937, 947, 953, 997, 1063, 1103, 1117, 1163, 1187, 1213, 1367, 1423, 1447
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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p=7, (p^2+1)/10=5; p=17, (p^2+1)/10=29
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MAPLE
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a := proc (n) if isprime(n) = true and type((1/10)*n^2+1/10, integer) = true and isprime((1/10)*n^2+1/10) = true then n else end if end proc: seq(a(n), n = 1 .. 1800); [From Emeric Deutsch (deutsch(AT)duke.poly.edu), Jan 18 2009]
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CROSSREFS
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Cf. A017353, A154412
Sequence in context: A136083 A167276 A154408 this_sequence A089531 A138337 A029477
Adjacent sequences: A154408 A154409 A154410 this_sequence A154412 A154413 A154414
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KEYWORD
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nonn
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AUTHOR
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Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Jan 09 2009
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EXTENSIONS
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Corrected and extended by Emeric Deutsch (deutsch(AT)duke.poly.edu), Jan 18 2009
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