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A130008 Noncomposite numbers sandwiched between 1's. 2
1, 1, 1, 2, 1, 3, 1, 5, 1, 7, 1, 11, 1, 13, 1, 17, 1, 19, 1, 23, 1, 29, 1, 31, 1, 37, 1, 41, 1, 43, 1, 47, 1, 53, 1, 59, 1, 61, 1, 67, 1, 71, 1, 73, 1, 79, 1, 83, 1, 89, 1, 97, 1, 101, 1, 103, 1, 107, 1, 109, 1, 113, 1, 127, 1, 131, 1, 137, 1, 139, 1, 149 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

COMMENTS

A000012 and A008578 interleaved. - Omar E. Pol, Feb 05 2014

LINKS

Table of n, a(n) for n=0..71.

EXAMPLE

Difference array begins:

1 1 1 2 1 3 1 5 1 7 1 11

.. 0 0 1 -1 2 -2 4 -4 6 -6 10

..... 0 1 -2 3 -4 6 -8 10 -12 16

........ 1 -3 5 -7 10 -14 18 -22 28

CROSSREFS

Cf. A000040.

Sequence in context: A319627 A217668 A119479 * A101809 A127203 A227288

Adjacent sequences:  A130005 A130006 A130007 * A130009 A130010 A130011

KEYWORD

nonn,easy

AUTHOR

Paul Curtz, Jun 15 2007

EXTENSIONS

More terms and definition corrected by Omar E. Pol, Feb 05 2014

STATUS

approved

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Last modified August 25 13:50 EDT 2019. Contains 326324 sequences. (Running on oeis4.)