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A136005 Numbers of the form 2^p - 1, where p is a prime number that is not the sum, minus 1, of a Pythagorean triple. 10
3, 7, 31, 127, 8191, 131071, 524287, 2147483647, 137438953471, 2199023255551, 8796093022207, 9007199254740991, 2305843009213693951, 147573952589676412927, 9444732965739290427391 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

See A136003 for the values of p.

LINKS

Table of n, a(n) for n=1..15.

FORMULA

a(n) = 2^A136003(n) - 1.

EXAMPLE

a(3)=31 because A136003(3)=5 and 2^5=32 and 32-1=31.

CROSSREFS

Cf. A000079, A000668, A136002, A136003.

Sequence in context: A093535 A081093 A057612 * A183077 A088552 A000668

Adjacent sequences:  A136002 A136003 A136004 * A136006 A136007 A136008

KEYWORD

nonn

AUTHOR

Omar E. Pol, Dec 17 2007

STATUS

approved

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Last modified July 27 04:25 EDT 2017. Contains 289841 sequences.