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A088629 Smallest number k not included earlier such that the concatenation n, k is a prime. 1
1, 3, 7, 19, 9, 13, 27, 11, 29, 21, 17, 23, 61, 33, 31, 37, 41, 47, 49, 39, 43, 51, 57, 59, 79, 63, 53, 87, 69, 67, 81, 71, 73, 91, 83, 77, 93, 89, 103, 99, 113, 97, 117, 101, 119, 133, 111, 109, 121, 123, 131, 127, 129, 139, 147, 149, 107, 151, 141, 161, 153, 137, 179 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Another rearrangement of odd numbers not == 0 mod 5.

LINKS

Table of n, a(n) for n=1..63.

EXAMPLE

a(4) = 19. Though 41, 43 and 47 are prime 1, 3 and 7 have been included earlier and also 49, 411, 413 and 417 are not prime hence 419 is the required prime.

CROSSREFS

Cf. A088630.

Sequence in context: A270519 A212848 A217371 * A075609 A083439 A151858

Adjacent sequences:  A088626 A088627 A088628 * A088630 A088631 A088632

KEYWORD

base,nonn

AUTHOR

Amarnath Murthy, Oct 21 2003

EXTENSIONS

More terms from Ray G. Opao, Aug 19 2004

STATUS

approved

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Last modified February 27 06:59 EST 2020. Contains 332299 sequences. (Running on oeis4.)