id:A109944 - OEIS Search Results

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a(1) = 1, a(n) = smallest prime number beginning with n if n is composite or vise versa. If n is prime a(n) = 10n.

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1, 20, 30, 41, 50, 61, 70, 83, 97, 101, 110, 127, 130, 149, 151, 163, 170, 181, 190, 2003, 211, 223, 230, 241, 251, 263, 271, 281, 290, 307, 310, 3203, 331, 347, 353, 367, 370, 383, 397, 401, 410, 421, 430, 443, 457, 461, 470, 487, 491, 503, 5101, 521, 530, 541 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`If n is composite, a(n) = A018800(n). - David Wasserman (wasserma(AT)spawar.navy.mil), Jul 19 2005`
	CROSSREFS	`Sequence in context: A132067 A072989 A166730 this_sequence A108030 A095787 A120145` `Adjacent sequences: A109941 A109942 A109943 this_sequence A109945 A109946 A109947`
	KEYWORD	`base,easy,nonn`
	AUTHOR	`Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Jul 19 2005`
	EXTENSIONS	`More terms from David Wasserman (wasserma(AT)spawar.navy.mil), Jul 19 2005`

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Last modified December 11 12:57 EST 2009. Contains 170656 sequences.

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