id:A068650 - OEIS Search Results

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Primes in which a string of 1's is sandwiched between two 3's.

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313, 3111111111113, 311111111111113, 3111111111111111111111111111113, 311111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111113 (list; graph; listen)

	OFFSET	`0,1`
	MAPLE	`a := 3:b := 1:i := 1:for n from 0 to 500 do c := a+10(10^n-1)/9b+10^(n+1)*a; if(isprime(c)) then d[i] := c; i := i+1; end if; end do:q := seq(d[j], j=1..i-1);`
	CROSSREFS	`Cf. A068645, A068646, A068647, A068648, A068649.` `Sequence in context: A108845 A123059 A083997 this_sequence A106156 A107116 A107115` `Adjacent sequences: A068647 A068648 A068649 this_sequence A068651 A068652 A068653`
	KEYWORD	`base,nonn`
	AUTHOR	`Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Feb 28 2002`
	EXTENSIONS	`More terms from Sascha Kurz (sascha.kurz(AT)uni-bayreuth.de), Mar 19 2002`

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Last modified September 4 21:24 EDT 2008. Contains 143414 sequences.

AT&T Labs Research