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A086553 a(1) = 1, a(n) = smallest number not included earlier such that both a(n) + 1 and a(n)*a(n-1) + 1 are primes. 0
1, 2, 6, 10, 4, 18, 22, 16, 12, 28, 36, 46, 30, 40, 52, 60, 42, 58, 72, 88, 112, 66, 70, 82, 78, 96, 100, 106, 130, 126, 102, 136, 148, 162, 108, 166, 180, 138, 156, 172, 150, 178, 250, 190, 210, 196, 192, 228, 240, 198, 280, 226, 232, 238, 222, 268, 282, 306, 262 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

Conjecture: every number p-1 is a term for all primes p.

LINKS

Table of n, a(n) for n=0..58.

CROSSREFS

Sequence in context: A052194 A320383 A073662 * A342068 A004055 A077933

Adjacent sequences:  A086550 A086551 A086552 * A086554 A086555 A086556

KEYWORD

nonn

AUTHOR

Amarnath Murthy, Aug 29 2003

EXTENSIONS

More terms from David Wasserman, Mar 25 2005

STATUS

approved

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Last modified June 21 19:59 EDT 2021. Contains 345365 sequences. (Running on oeis4.)