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Smallest number prefixed with corresponding term of the sequence of numbers == 1, 3, 7 or 9 (mod 10), i.e., (1, 3, 7, 9, 11, 13, 17, 19, 21, 23, 27, 29, 31, 33, 37, 39, ...) that yields a prime.
(history; published version)

#7 by Jon E. Schoenfield at Sat Jul 29 13:16:11 EDT 2017

STATUS

editing

approved

#6 by Jon E. Schoenfield at Sat Jul 29 13:16:06 EDT 2017

NAME

Smallest number prefixed with corresponding term of the sequence of numbers == 1, 3, 7 or 9 (mod 10), i.e. , (1, 3, 7, 9, 11, 13, 17, 19, 21, 23, 27, 29, 31, 33, 37, 39, ...) that yields a prime.

STATUS

approved

editing

#5 by N. J. A. Sloane at Thu Dec 05 19:56:33 EST 2013

AUTHOR

_Amarnath Murthy (amarnath_murthy(AT)yahoo.com), _, Sep 28 2003

Discussion

Thu Dec 05

19:56

OEIS Server: https://oeis.org/edit/global/2075

#4 by Russ Cox at Sat Mar 31 13:20:51 EDT 2012

EXTENSIONS

More terms from _David Wasserman (wasserma(AT)spawar.navy.mil), _, Jul 27 2005

Discussion

Sat Mar 31

13:20

OEIS Server: https://oeis.org/edit/global/880

#3 by N. J. A. Sloane at Wed Sep 21 03:00:00 EDT 2005

DATA

1, 1, 1, 1, 2, 1, 6, 3, 4, 4, 2, 1, 2, 1, 2, 1, 1, 2, 4, 3, 1, 1, 3, 1, 3, 4, 1, 1, 2, 2, 1, 2, 1, 1, 2, 4, 3, 1, 1, 1, 1, 5, 1, 5, 1, 2, 2, 1, 3, 3, 1, 4, 1, 2, 4, 2, 4, 2, 2, 5, 11, 1, 1, 4, 4, 2, 1, 3, 3, 1, 6, 4, 2, 1, 13, 1, 5, 3, 1, 5, 6, 1, 2, 2, 3, 4, 1, 1, 4, 2, 1, 5, 1, 1, 5, 1, 2, 4, 2, 6, 1, 2, 3, 3, 1, 4

KEYWORD

base,easy,nonn,new

EXTENSIONS

More terms from David Wasserman (wasserma(AT)spawar.navy.mil), Jul 27 2005

#2 by N. J. A. Sloane at Wed Sep 22 03:00:00 EDT 2004

NAME

Smallest number prefixed with corresponding term of the sequence of numbers == 1, 3, 7 or 9 (mod 10), i.e. (1, 3, 7, 9, 11, 13, 17, 19, 21, 23, 27, 29, 31, 33, 37, 39, ...) that yields a prime.

KEYWORD

base,easy,nonn,new

#1 by N. J. A. Sloane at Thu Feb 19 03:00:00 EST 2004

NAME

Smallest number prefixed with corresponding term of the sequence of numbers == 1, 3, 7 or 9(mod 10), i.e. (1, 3, 7, 9, 11, 13, 17, 19, 21, 23, 27, 29, 31, 33, 37, 39, ...) that yields a prime.

DATA

1, 1, 1, 1, 2, 1, 6, 4, 4, 2, 2, 2, 1, 2, 1, 1, 2, 4, 3, 1, 1, 3, 1, 3, 4, 1, 1, 2, 2, 1, 2, 1

OFFSET

0,5

EXAMPLE

The term corresponding to 61 is 4 as 161, 261 and 361 are composite.

KEYWORD

base,easy,nonn

AUTHOR

Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Sep 28 2003

STATUS

approved