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A324294 a(n) = A002487(1+sigma(n)). 2
1, 1, 3, 1, 3, 5, 4, 1, 3, 7, 5, 7, 4, 7, 7, 1, 7, 3, 8, 13, 6, 11, 7, 9, 1, 13, 11, 10, 5, 15, 6, 1, 9, 11, 9, 7, 10, 9, 10, 19, 13, 11, 12, 21, 13, 15, 9, 11, 7, 9, 15, 16, 11, 13, 15, 13, 14, 19, 9, 29, 6, 11, 18, 1, 21, 19, 14, 7, 11, 19, 15, 9, 18, 17, 11, 22, 11, 29, 14, 25, 9, 7, 21, 16, 19, 17, 13, 31, 19, 29, 13, 29, 8, 19, 13, 13, 16 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Antti Karttunen, Table of n, a(n) for n = 1..16384

Antti Karttunen, Data supplement: n, a(n) computed for n = 1..65537

Index entries for sequences related to sigma(n)

Index entries for sequences related to Stern's sequences

FORMULA

a(n) = A002487(1+sigma(n)).

a(2^n) = 1 for all n >= 0, but also for some other numbers, e.g., a(25) = 1.

PROG

(PARI)

A002487(n) = { my(s=sign(n), a=1, b=0); n = abs(n); while(n>0, if(bitand(n, 1), b+=a, a+=b); n>>=1); (s*b); };

A324294(n) = A002487(1+sigma(n));

CROSSREFS

Cf. A000203, A002487, A324288, A324293.

Sequence in context: A122582 A173039 A016471 * A082082 A016646 A182600

Adjacent sequences:  A324291 A324292 A324293 * A324295 A324296 A324297

KEYWORD

nonn

AUTHOR

Antti Karttunen, Feb 22 2019

STATUS

approved

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Last modified January 26 23:05 EST 2020. Contains 331289 sequences. (Running on oeis4.)