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Left-truncatable semiprimes, i.e. semiprimes in which repeatedly deleting the leftmost digit gives a semiprime at every step until a single digit semiprime remains.

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4, 6, 9, 14, 26, 34, 39, 46, 49, 69, 74, 86, 94, 134, 146, 169, 194, 214, 226, 249, 274, 314, 326, 334, 339, 346, 386, 394, 446, 469, 514, 526, 586, 614, 626, 634, 649, 669, 674, 694, 734, 746, 749, 794, 849, 869, 886, 914, 926, 934, 939, 949, 974, 1169, 1214 (list; graph; listen)

	OFFSET	`1,1`
	REFERENCES	`Angell, I. O. and Godwin, H. J. "On Truncatable Primes." Math. Comput. 31, 265-267, 1977.`
	LINKS	`Index entries for sequences related to truncatable primes`
	EXAMPLE	`a(15)=146 is a term because 146, 46, 6 are all semiprimes.`
	CROSSREFS	`Sequence in context: A118692 A020706 A137371 this_sequence A078443 A085751 A116589` `Adjacent sequences: A086694 A086695 A086696 this_sequence A086698 A086699 A086700`
	KEYWORD	`base,nonn`
	AUTHOR	`Shyam Sunder Gupta (guptass(AT)rediffmail.com), Jul 28 2003`

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Last modified November 21 14:49 EST 2008. Contains 150807 sequences.

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