id:A154520 - OEIS Search Results

Search: id:A154520

Displaying 1-1 of 1 results found.

page 1

The prime(n)-th digit of the concatenated non-primes.

+0
3

1, 4, 8, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, 5, 5, 5, 5, 6, 6, 7, 7, 7, 7, 7, 8, 9, 9, 9, 9, 0, 1, 1, 1, 1, 1, 1, 1, 2, 1, 2, 1, 1, 1, 3, 1, 3, 4, 1, 4, 4, 4, 5, 1, 1, 5, 1, 6, 1, 6, 1, 7, 1, 1, 8, 1, 8, 8, 1, 1, 1, 0, 0, 2, 0, 2, 1, 2, 1, 2, 2, 2, 2, 2, 3, 2, 3, 3, 2, 4, 2, 4, 4, 5, 2, 2, 2, 6, 7, 7, 2 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`The concatenated non-primes A141468 are A129808 with an initial 0.`
	FORMULA	`a(n) = A129808(prime(n)-1) .`
	MAPLE	`a129808 := [1] : for n from 4 to 400 do if not isprime(n) then a129808 := [op(a129808), op(ListTools[Reverse](convert(n, base, 10))) ] ; fi; od:` `for n from 1 do p := ithprime(n) ; printf("%d, ", op(p-1, a129808) ) ; od: # R. J. Mathar, Aug 03 2009`
	CROSSREFS	`Cf. A000040, A141468.` `Sequence in context: A042972 A021875 A127734 this_sequence A002390 A122149 A021679` `Adjacent sequences: A154517 A154518 A154519 this_sequence A154521 A154522 A154523`
	KEYWORD	`nonn,base`
	AUTHOR	`Juri-Stepan Gerasimov (2stepan(AT)rambler.ru), Jan 11 2009`
	EXTENSIONS	`Edited and extended by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Aug 03 2009`

page 1

Search completed in 0.002 seconds

Last modified November 30 13:13 EST 2009. Contains 167758 sequences.

AT&T Labs Research