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 A080331 Index in A002858 of the larger of the two Ulam numbers that sum to the n-th Ulam number. 4
 0, 0, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 13, 15, 15, 17, 13, 17, 20, 20, 20, 20, 20, 25, 26, 27, 28, 20, 20, 27, 25, 33, 27, 28, 36, 37, 38, 27, 40, 38, 42, 42, 44, 40, 46, 47, 48, 42, 40, 51, 52, 38, 53, 44, 56, 56, 54, 59, 55, 61, 56, 53, 61, 65, 65, 67, 61, 69, 70 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS The first two terms in this sequence are zero because the Ulam sequence (A002858) is initialized for those terms. The terms of the sum are in A080328 and A080329 and the indices are in A080330 and A080331. LINKS Rémy Sigrist, Table of n, a(n) for n = 1..10000 Rémy Sigrist, PARI program for A080331 EXAMPLE The 11th Ulam number (26) is the sum of the 6th Ulam number (8) and the 10th Ulam number (18), so a(11)=10. PROG (PARI) See Links section. CROSSREFS Cf. A002858, A080328, A080329, A080330. Sequence in context: A291579 A331300 A274933 * A297247 A167463 A053835 Adjacent sequences:  A080328 A080329 A080330 * A080332 A080333 A080334 KEYWORD nonn AUTHOR Jud McCranie, Feb 15 2003 STATUS approved

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Last modified January 24 19:34 EST 2022. Contains 350565 sequences. (Running on oeis4.)