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A153767 Numbers n such that n and 8n-9 are both prime 2
2, 5, 7, 11, 17, 29, 31, 47, 59, 61, 109, 131, 137, 139, 167, 179, 181, 197, 199, 229, 251, 269, 277, 281, 307, 337, 347, 367, 379, 397, 419, 421, 449, 467, 479, 491, 521, 557, 599, 601, 619, 631, 641, 647, 661, 677, 691, 719, 727, 739, 757, 761, 769, 787, 797 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

EXAMPLE

For n=31, 8n-9=239; n=181, 8n-9=1439

CROSSREFS

Cf. A153766

Sequence in context: A106008 A138244 A019396 * A038973 A197297 A172527

Adjacent sequences:  A153764 A153765 A153766 * A153768 A153769 A153770

KEYWORD

nonn

AUTHOR

Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Jan 01 2009

EXTENSIONS

4 removed, extended by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jan 07 2009

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Last modified February 14 11:36 EST 2012. Contains 205623 sequences.