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A101766 Iccanobif semiprime indices: Indices of semiprime numbers in A014260. 3
8, 16, 18, 21, 26, 38, 42, 44, 49, 54, 55, 57, 61, 67, 77, 78, 115, 123, 134, 145, 151, 154, 202, 218, 249, 286, 349, 403, 498, 539 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Table of n, a(n) for n=0..29.

MATHEMATICA

nxt[{a_, b_}]:={b, IntegerReverse[a]+b}; Flatten[Position[NestList[nxt, {0, 1}, 600][[All, 1]], _?(PrimeOmega[#]==2&)]]-1 (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Jul 04 2018 *)

CROSSREFS

Cf. A001358, A001129, A014258-A014260, A101763-A101765.

Sequence in context: A004779 A247061 A180860 * A140270 A257225 A092456

Adjacent sequences:  A101763 A101764 A101765 * A101767 A101768 A101769

KEYWORD

nonn,more

AUTHOR

Jonathan Vos Post and Ray Chandler, Dec 15 2004

STATUS

approved

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Last modified May 23 03:10 EDT 2019. Contains 323507 sequences. (Running on oeis4.)