A137903 - OEIS

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A137903

Limiting sequence when we start with positive integers (A000027) and at step n >= 1 add to the term at position n + a(n) the value a(n) if the term is odd, else divide the term by 2.

1, 1, 4, 4, 5, 6, 11, 4, 9, 5, 11, 3, 13, 14, 10, 16, 17, 18, 19, 20, 21, 11, 23, 24, 35, 13, 27, 14, 29, 30, 31, 16, 44, 17, 35, 18, 37, 19, 52, 20, 41, 35, 43, 44, 45, 23, 47, 12, 49, 50, 68, 52, 53, 45, 55, 56, 76, 29, 59, 47, 61, 31, 63, 64, 65, 66, 67, 68, 92, 35

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,3

LINKS

Table of n, a(n) for n=1..70.

PROG

(PARI) lista(nn) = my(va = [1..nn]); for (n=1, nn, my(m = n+va[n]); if (m <= nn, if (va[m] % 2, va[m]+=va[n], va[m] /= 2)); ); va; \\ Michel Marcus, Oct 29 2022

CROSSREFS

Cf. A000027, A136119, A137319, A137417, A137418, A136259, A136272, A137901, A137902.

Sequence in context: A137902 A019527 A062836 * A091349 A103483 A170934

Adjacent sequences: A137900 A137901 A137902 * A137904 A137905 A137906

KEYWORD

easy,nonn

AUTHOR

Ctibor O. Zizka, Apr 30 2008

EXTENSIONS

Entries corrected and extended by Paolo P. Lava, Mar 10 2009

More terms from Michel Marcus, Oct 29 2022

STATUS

approved