id:A068674 - OEIS Search Results

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Numbers which yields primes when a 3 is prefixed or appended.

+0
7

1, 7, 11, 17, 31, 37, 59, 67, 73, 109, 119, 121, 137, 169, 187, 191, 221, 229, 259, 271, 331, 343, 359, 361, 373, 407, 413, 449, 467, 499, 511, 527, 533, 539, 541, 557, 581, 607, 613, 617, 637, 673, 701, 719, 733, 739, 767, 779, 793, 823, 851, 889, 917, 929 (list; graph; listen)

	OFFSET	`1,2`
	EXAMPLE	`73 is a term as 373 as well as 733 are primes.`
	MAPLE	`i := 0:for k from 1 to 3200 do if(isprime(3+10k) and isprime(k+10^(ceil(evalf(log(k+1)/log(10))))3)) then s[i] := k; i := i+1; end if; end do:q := seq(s[j], j=0..i-1);`
	CROSSREFS	`Cf. A068673.` `Sequence in context: A063912 A078725 A019418 this_sequence A156112 A158594 A107642` `Adjacent sequences: A068671 A068672 A068673 this_sequence A068675 A068676 A068677`
	KEYWORD	`base,easy,nonn`
	AUTHOR	`Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Mar 02 2002`
	EXTENSIONS	`More terms from Sascha Kurz (sascha.kurz(AT)uni-bayreuth.de), Mar 17 2002`

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Last modified December 15 00:47 EST 2009. Contains 170825 sequences.

AT&T Labs Research