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A173168 Primes of the form 2^k + 2k - 1. 3
3, 7, 13, 23, 41, 271, 2069, 16411, 32797, 134217781, 2199023255633, 1125899906842723, 2251799813685349, 2596148429267413814265248164610269, 11150372599265311570767859136324180752990493 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Primes in A061761. The values of k-1 are in A105330. These primes, multiplied by 2^(k-1), produce A105331, which are a subset of the dihedral perfect numbers, A083874.

LINKS

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

MATHEMATICA

g[n_]:=2^n+2*n-1; Select[Array[g, 100], PrimeQ]

CROSSREFS

Sequence in context: A081494 A161909 A281131 * A048462 A048465 A049112

Adjacent sequences:  A173165 A173166 A173167 * A173169 A173170 A173171

KEYWORD

nonn

AUTHOR

T. D. Noe, Feb 11 2010

STATUS

approved

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Last modified September 15 04:09 EDT 2019. Contains 327062 sequences. (Running on oeis4.)