A135630 - OEIS

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A135630

2^(prime(n) - 2) - 1.

0, 1, 7, 31, 511, 2047, 32767, 131071, 2097151, 134217727, 536870911, 34359738367, 549755813887, 2199023255551, 35184372088831, 2251799813685247, 144115188075855871, 576460752303423487, 36893488147419103231, 590295810358705651711 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,3`
	FORMULA	`a(n) = 2^(A000040(n)-2) - 1 = 2^(A040976(n)) - 1 = (2^A000040(n)/4) - 1 = (A061286(n)/2) - 1.`
	EXAMPLE	`a(4)=31 because the 4th prime number is 7 and 7-2=5 and 2^5=32 and 32-1=31.`
	MATHEMATICA	`Table[2^(Prime[n]-2)-1, {n, 20}] (* From Harvey P. Dale, Feb 25 2011 *)`
	CROSSREFS	`Cf. A000040, A040976, A061286.` `Sequence in context: A094711 A143564 A153028 * A139287 A139307 A197451` `Adjacent sequences: A135627 A135628 A135629 * A135631 A135632 A135633`
	KEYWORD	`easy,nonn`
	AUTHOR	`Omar E. Pol (info(AT)polprimos.com), Mar 01 2008`
	EXTENSIONS	`More terms from Harvey P. Dale, Feb 25 2011`

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Last modified February 16 03:44 EST 2012. Contains 205860 sequences.