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 A239659 Sum of first n parts of the spiral described in A239660. 1
 1, 4, 6, 8, 15, 18, 21, 33, 37, 41, 56, 61, 64, 69, 78, 87, 93, 99, 127, 134, 141, 153, 165, 173, 181, 189, 220, 229, 238, 277, 287, 297, 339, 350, 355, 360, 371, 389, 407, 419, 431, 491, 504, 509, 522, 543, 564, 578, 584, 590, 604, 660, 675, 690, 762, 778, 794, 857, 874, 881, 888, 905, 932, 959, 977, 989, 1007, 1098 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS We can find the spiral on the terraces of the step pyramid described in A244050. - Omar E. Pol, Dec 07 2016 LINKS EXAMPLE If written as an irregular triangle in which row lengths is A237271 the sequence begins: 1; 4; 6, 8; 15; 18, 21; 33; 37, 41; 56; 61, 64, 69; 78, 87; 93, 99; 127; 134, 141; 153, 165; 173, 181, 189; 220; 229, 238; 277; 287, 297; 339; 350, 355, 360, 371; 389, 407; 419, 431; 491; 504, 509, 522; ... Right border gives A024916. CROSSREFS Partial sums of A237270. Cf. A000203, A024916, A196020, A237593, A237271, A239660, A244050, A245092, A262626. Sequence in context: A302636 A000937 A138001 * A154387 A095299 A079250 Adjacent sequences:  A239656 A239657 A239658 * A239660 A239661 A239662 KEYWORD nonn,tabf AUTHOR Omar E. Pol, Mar 31 2014 STATUS approved

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Last modified September 17 12:57 EDT 2019. Contains 327131 sequences. (Running on oeis4.)